Caroline Wozniacki

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Maria Sharapova, of Russia, makes a return against Caroline Wozniacki, of Denmark, during their match at the BNP Paribas Open tennis tournament on Sunday, March 17, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Serena Williams of the United States returns a shot to Caroline Wozniacki of Denmark at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. (AP Photo/Mark Humphrey)

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Caroline Wozniacki waves to the crowd after beating Anna Tatishvili during their second-round match at the Australian Open, in Melbourne, Australia, Wednesday, Jan. 18, 2012. (AP Photo/Rick Rycroft)

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Serena Williams reacts after winning her semifinal match against Caroline Wozniacki of Denmark at the U.S. Open in New York on Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

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Caroline Wozniacki, of Denmark, returns to Svetlana Kuznetsova, of Russia, in the fourth round of the U.S. Open tennis tournament, Monday, Sept. 5, 2011, in New York. (AP Photo/Elise Amendola)