Caroline Wozniacki

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Caroline Wozniacki returns against Daniela Hantuchova on May 27, 2011, in a third-round match in the French Open tennis tournament at Roland Garros Stadium in Paris. (Associated Press)

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Denmark's Caroline Wozniacki reacts Sunday after beating Russia's Svetlana Kuznetsova during the final match of Dubai WTA Tennis Championships in Dubai, United Arab Emirates. (Associated Press)

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Denmark's Caroline Wozniacki makes a forehand return to Italy's Francesca Schiavone during their quarterfinal match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 25, 2011. (AP Photo/Andrew Brownbill)

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Caroline Wozniacki, of Denmark, lifts her trophy after defeating Nadia Petrova, of Russia, 6-3, 3-6, 6-3, in the women's final of the Pilot Pen tennis tournament in New Haven, Conn., on Saturday, Aug. 28, 2010. (AP Photo/Fred Beckham)

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Caroline Wozniacki from Denmark holds up the trophy after beating Vera Zvonareva from Russia in the final at the Rogers Cup tennis tournament Monday, Aug. 23, 2010 in Montreal. (AP Photo/The Canadian Press,Paul Chiasson)