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/Jason DeCrow)

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/Jason DeCrow)

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