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

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