ROME, ITALY - MAY 15: Sloane Stephens of the USA plays a forehand against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA plays a forehand against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA celebrates a point against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA shows her emotions against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA serves against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA serves against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Kiki Bertens of Netherlands plays a backhand against Sloane Stephens of the USA in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA plays a backhand against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA serves against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

ROME, ITALY - MAY 15: Sloane Stephens of the USA plays a forehand against Kiki Bertens of Netherlands in their second round match during day four of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 15, 2013 in Rome, Italy. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China plays a backhand to Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China deep in thought against Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China deep in thought against Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China deep in thought against Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China celebrates match point against Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China serves to Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Li Na of China adjusts her strings against Kiki Bertens of Netherlands during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Kiki Bertens of Netherlands shows her dejection against Li Na of China during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Kiki Bertens of Netherlands plays a backhand to Li Na of China during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 21: Kiki Bertens of Netherlands plays a backhand to Li Na of China during their second round match at the Sony Open at Crandon Park Tennis Center on March 21, 2013 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)