Sony Open | Thu., March 21, 2013

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  Defending champ Agnieszka Radwanska returns a shot against Hsieh Su-Wei as they play the second set of their second round match at the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / miami herald staff

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  Defending champ Agnieszka Radwanska returns a shot against Hsieh Su-Wei as they play the second set of their second round match at the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens prepares to hit a forehand in the second set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens prepares to hit a backhand in the third set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens prepares to hit a backhand in the first set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens prepares to hit a forehand in the second set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Hsieh Su-Wei misses a shot against defending champ Agnieszka Radwanska as they play the second set of their second round match at the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens prepares to hit a backhand in the third set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens hits a backhand in the third set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Radwanska C.W. Griffin / Staff Photo

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  Defending champ Agnieszka Radwanska prepares to return a shot against Hsieh Su-Wei as they play the second set of their second round match at the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Olga Govortsova hits a backhand in the first set against Sloane Stephens as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Olga Govortsova hits a forehand in the second set against Sloane Stephens as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Sloane Stephens hits a forehand in the second set against Olga Govortsova as they play their second round match at the Sony Open Tennis tournament at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams hits a forehanded shot in the second set against Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams pumps her fist after she hits a backhanded shotfor a winner in the second set against Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams hits a backhanded shot in the first set against Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams hits a lob shot in the second set against Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams hits a backhanded shot in the second set against Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo

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  Serena Williams dodges a bullet hit at her in the second set by Flavia Pennetta as they play the second round of the Sony Open Tennis matches at Crandon Park on Key Biscayne, Fl. March 21, 2013. C.W. Griffin / Staff Photo