Diego Schwartzman, of Argentina, serves to Novak Djokovic, of Serbia, 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

Diego Schwartzman, of Argentina, serves to Novak Djokovic, of Serbia, 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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