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

Sony Open Tennis

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

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