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Victoria Azarenka of Belarus returns the ball to Maria Sharapova of Russia during the WTA Championships tennis tournament in Istanbul, on October 27, 2012. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)

Victoria Azarenka of Belarus returns the ball to Maria Sharapova of Russia during the WTA Championships tennis tournament in Istanbul, on October 27, 2012. AFP PHOTO/BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)