Serena Williams of the US waves to spectators after her tennis match against Victoria Azarenka of Belarus during their tennis match on the third day of the WTA championship in Istanbul, Turkey, Thursday, Oct. 25, 2012. (AP Photo)

Associated Press
Serena Williams of the US waves to spectators after her tennis match against Victoria Azarenka of Belarus during their tennis match on the third day of the WTA championship in Istanbul, Turkey, Thursday, Oct. 25, 2012. (AP Photo)
Serena Williams of the US waves to spectators after her tennis match against Victoria Azarenka of Belarus during their tennis match on the third day of the WTA championship in Istanbul, Turkey, Thursday, Oct. 25, 2012. (AP Photo)
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