Alexandr Dolgopolov, of Ukraine, returns the ball to Dusan Lajovic, of Serbia, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Alexandr Dolgopolov, of Ukraine, returns the ball to Dusan Lajovic, of Serbia, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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