Li Na of China prepares to serve to Angelique Kerber of Germany during their tennis match on the third day of the WTA championship in Istanbul, Turkey, Thursday, Oct. 25, 2012. (AP Photo)

Associated Press
Li Na of China prepares to serve to Angelique Kerber of Germany during their tennis match on the third day of the WTA championship in Istanbul, Turkey, Thursday, Oct. 25, 2012. (AP Photo)
Li Na of China prepares to serve to Angelique Kerber of Germany 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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