Tomas Berdych, of the Czech Republic, returns the ball to John Isner, of the United States, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Key Biscayne Tennis

Tomas Berdych, of the Czech Republic, returns the ball to John Isner, of the United States, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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