Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

Sony Open Tennis

Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

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