Novak Djokovic, of Serbia, serves to Diego Schwartzman, of Argentina, during the opening round of the U.S. Open tennis tournament Monday, Aug. 25, 2014, in New York. (AP Photo/Darron Cummings)

US Open Tennis

Novak Djokovic, of Serbia, serves to Diego Schwartzman, of Argentina, during the opening round of the U.S. Open tennis tournament Monday, Aug. 25, 2014, in New York. (AP Photo/Darron Cummings)

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