Madison Keys, of the United States, returns the ball to Anett Kontaveit, of Estonia, during the Sony Open tennis tournament, Wednesday, March 19, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Madison Keys, of the United States, returns the ball to Anett Kontaveit, of Estonia, during the Sony Open tennis tournament, Wednesday, March 19, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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