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WINSTON SALEM, NC - AUGUST 23: Diego Schwartzman of Argentina returns a shot to Gilles Simon of France during the Winston-Salem Open at Wake Forest University on August 23, 2016 in Winston Salem, North Carolina. (Photo by Grant Halverson/Getty Images)

WINSTON SALEM, NC - AUGUST 23:  Diego Schwartzman of Argentina returns a shot to Gilles Simon of France during the Winston-Salem Open at Wake Forest University on August 23, 2016 in Winston Salem, North Carolina.  (Photo by Grant Halverson/Getty Images)