Victoria Azarenka

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Serena Williams defeated Victoria Azarenka in their semifinal match at Wimbledon on Thursday, July 5, 2012. (AP Photo/Anja Niedringhaus)

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Serena Williams celebrates after defeating Victoria Azarenka in the Wimbledon semifinals on July 5, 2012, in Wimbledon, England. (Associated Press)

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Serena Williams put away defending Wimbledon champion Petra Kvitova 6-3, 7-5 to set up a semifinal match with Victoria Azarenka on Thursday. (Associated Press)

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Victoria Azarenka poses with the championship trophy after defeating Maria Sharapova 6-2-6-3 in the women's final at the BNP Paribas Open tennis tournament Sunday, March 18, 2012, in Indian Wells, Calif. (AP Photo/Darron Cummings)

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Victoria Azarenka of Belarus kisses the trophy during the awarding ceremony after defeating Maria Sharapova of Russia in their women's singles final at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 28, 2012. (AP Photo/Rick Rycroft)

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Victoria Azarenka celebrates after defeating Mona Barthel during their third-round match at the Australian Open, in Melbourne, Australia, Friday, Jan. 20, 2012. (AP Photo/Rick Rycroft)

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ASSOCIATED PRESS A medical worker helps Victoria Azarenka of Belarus after Azarenka collapsed on the court while playing Gisela Dulko of Argentina at the U.S. Open tennis tournament in New York, Wednesday, Sept. 1, 2010. Azarenka was taken off the court in a wheelchair.