Serena Williams of the US returns a shot to Maria Sharapova of Russia during their final tennis match of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)

Associated Press
Serena Williams of the US returns a shot to Maria Sharapova of Russia during their final tennis match of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)
Serena Williams of the US returns a shot to Maria Sharapova of Russia during their final tennis match of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)
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