Roger Federer

One of the greatest tennis players of all time will represent Switzerland at the London Games.

Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski TPX IMAGES OF THE DAY
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski TPX IMAGES OF THE DAY
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves the ball to Milos Raonic during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Milos Raonic in the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer poses for media during the winner ceremony, after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display banners referencing Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display banners referencing Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates with an award after winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic. REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic. REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Roger Federer reacts during the final tennis match against Milos Raonic at the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts during the final tennis match against Milos Raonic at the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts during the final tennis match against Milos Raonic at the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer celebrates winning the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Milos Raonic returns the ball to Roger Federer during the final of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat/dpa via AP)
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic reacts during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Canada's Milos Raonic in action during the final against Switzerland's Roger Federer REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display banners referencing Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display banners referencing Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Switzerland's Roger Federer in action during the final against Canada's Milos Raonic REUTERS/Ralph Orlowski
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display a banner of Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
ATP 250 - Stuttgart Open
Tennis - ATP 250 - Stuttgart Open - Tennis Club Weissenhof, Stuttgart, Germany - June 17, 2018 Fans display a banner of Roger Federer during the final between Switzerland's Roger Federer and Canada's Milos Raonic REUTERS/Ralph Orlowski
Roger Federer of Switzerland hits a forehand against Thanasi Kokkinakis of Australia (not pictured) on day five of the Miami Open at Tennis Center at Crandon Park. Kokkinakis won 3-6, 6-3, 7-6(4). Geoff Burke-USA TODAY Sports
Tennis: Miami Open
Roger Federer of Switzerland hits a forehand against Thanasi Kokkinakis of Australia (not pictured) on day five of the Miami Open at Tennis Center at Crandon Park. Kokkinakis won 3-6, 6-3, 7-6(4). Geoff Burke-USA TODAY Sports
Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/Files
Tennis - ATP 500 - Rotterdam Open
Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/Files
Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/Files
Tennis - ATP 500 - Rotterdam Open
Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/Files
Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/Files
Tennis - ATP 500 - Rotterdam Open
Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/Files
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
Nick Kyrgios laughs during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Nick Kyrgios laughs during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Nick Kyrgios laughs during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Nick Kyrgios returns a ball during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Nick Kyrgios returns a ball during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Nick Kyrgios returns a ball during the semifinal tennis match against Roger Federer during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns a ball during the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer celebrates winning the semifinal tennis match against Nick Kyrgios during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Nick Kyrgios returns the ball to Roger Federer in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Nick Kyrgios returns the ball to Roger Federer in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Nick Kyrgios returns the ball to Roger Federer in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
Roger Federer returns the ball to Nick Kyrgios in their semifinal tennis match during the ATP Mercedes Cup in Stuttgart, Saturday June 16, 2018.(Marijan Murat/dpa via AP)
FILE PHOTO: Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 16, 2018 Roger Federer of Switzerland celebrates after defeating Robin Haase of the Netherlands. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/File Photo
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren/File Photo
Roger Federer reacts at the quarterfinal match against Guido Pella during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts at the quarterfinal match against Guido Pella during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts at the quarterfinal match against Guido Pella during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer plays against Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer plays against Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer plays against Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
Tennis - ATP World Tour Finals
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
Tennis - ATP World Tour Finals
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
Tennis - ATP World Tour Finals
FILE PHOTO: ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 Switzerland's Roger Federer in action during his semi final match against Belgium's David Goffin REUTERS/Toby Melville
Roger Federer returns the ball to Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Guido Pella in their quarterfinal tennis match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer rejoint les demies à Stuttgart/Photo prise le 17 mars 2018/REUTERS/USA Today Sports
Roger Federer à une victoire de la place de numéro 1
Roger Federer rejoint les demies à Stuttgart/Photo prise le 17 mars 2018/REUTERS/USA Today Sports
Roger Federer returns the ball to Guido Pella in their quarterfinal match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Guido Pella in their quarterfinal match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
Roger Federer returns the ball to Guido Pella in their quarterfinal match during the ATP Mercedes Cup in Stuttgart, Friday June 15, 2018. (Marijan Murat/dpa via AP)
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Roger Federer serves to Mischa Zverev during their match, at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves to Mischa Zverev during their match, at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves to Mischa Zverev during their match, at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open
FILE PHOTO: Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Tennis - ATP 500 - Rotterdam Open
Tennis - ATP 500 - Rotterdam Open - Final - Ahoy, Rotterdam, Netherlands - February 18, 2018 - Roger Federer of Switzerland celebrates after winning against Grigor Dimitrov of Bulgaria. REUTERS/Michael Kooren
Roger Federer serves to Mischa Zverev during their match the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves to Mischa Zverev during their match the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer serves to Mischa Zverev during their match the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Mischa Zverev returns the ball to Roger Federer during their match at the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer, left, greets Mischa Zverev, right, after Federer beat Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer, left, greets Mischa Zverev, right, after Federer beat Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer, left, greets Mischa Zverev, right, after Federer beat Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer celebrates as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)
Roger Federer reacts as he defeats Mischa Zverev during the ATP Mercedes Cup tournament in Stuttgart, Germany, Wednesday, June 13, 2018. (Marijan Murat/dpa via AP)

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