Novak Djokovic, of Serbia, returns a shot 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, returns a shot 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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