Wozniacki, Kvitova serve up wins at the WTA finals

Caroline Wozniacki of Denmark hits a return to Agnieszka Radwanska of Poland during their WTA tennis championships match in Istanbul on October 25, 2011. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)

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Top-ranked Caroline Wozniacki rallied to defeat Agnieszka Radwanska of Poland 5-7, 6-2, 6-4 Tuesday in their opening round-robin match at the WTA Championships. (AP)

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