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

Sony Open Tennis

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

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