Grigor Dimitrov, of Bulgaria, returns the ball to Albert Montanes, of Spain, during the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Grigor Dimitrov, of Bulgaria, returns the ball to Albert Montanes, of Spain, during the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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