Serena Williams of the US returns a shot to Na Li of China during their tennis match on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)

Associated Press
Serena Williams of the US returns a shot to Na Li of China during their tennis match on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)
Serena Williams of the US returns a shot to Na Li of China during their tennis match on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)
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