Madison Keys, of the United States, returns to Li Na, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Sunday, March 23, 2014. (AP Photo/Alan Diaz)

Sony Open Tennis

Madison Keys, of the United States, returns to Li Na, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Sunday, March 23, 2014. (AP Photo/Alan Diaz)

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