China's Li Na adjusts the strings on her racket during her match against Britain's Laura Robson in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. Li Na lost the match. (AP Photo/Paul Bereswill)

Associated Press
China's Li Na adjusts the strings on her racket  during her match against Britain's Laura Robson in the third round of play at the 2012 US Open tennis tournament,  Friday, Aug. 31, 2012, in New York. Li Na lost the match. (AP Photo/Paul Bereswill)
China's Li Na adjusts the strings on her racket during her match against Britain's Laura Robson in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. Li Na lost the match. (AP Photo/Paul Bereswill)
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