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

Sony Open Tennis

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

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