Roger Federer

Associated Press
FILE - In this July 6, 2014, file photo, Roger Federer of Switzerland leaps in an attempt to play a return to Novak Djokovic of Serbia during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London. Heading into the U.S. Open, Federer, Rafael Nadal, Novak Djokovic and Andy Murray have won 36 of the past 38 Grand Slam titles, a stretch dating to the 2005 French Open. Nowadays, there seems to be a growing sense _ or hope, maybe _ among the best of the rest on the men's tennis tour that the quartet might be more vulnerable than ever. (AP Photo/Sang Tan, Pool, File)

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

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