Svetlana Kuznetsova

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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)

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Carolina Wozniacki of Denmark holds up the trophy after winning the final of the Dubai WTA Tennis Championships against Russia's Svetlana Kuznetsova in Dubai, United Arab Emirates Sunday, Feb. 20, 2011.(AP Photo/Nousha Salimi)

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Carolina Wozniacki of Denmark reacts after winning the match against Russia's Svetlana Kuznetsova during the final of the Emirates Dubai WTA Tennis Championships in Dubai, United Arab Emirates Sunday, Feb. 20, 2011. (AP Photo/Nousha Salimi)

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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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Svetlana Kuznetsova, of Russia, serves to Flavia Pennetta, of Italy, during the Mercury Insurance Open tennis tournament in Carlsbad, Calif., Saturday, Aug. 7, 2010. (AP Photo/Chris Carlson)