Maria Sharapova of Russia reacts after she lost her tennis match against Serena Williams of the US after the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)

Associated Press
Maria Sharapova of Russia reacts after she lost her tennis match against Serena Williams of the US after the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)
Maria Sharapova of Russia reacts after she lost her tennis match against Serena Williams of the US after the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)
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