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

Sony Open Tennis

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

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