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PARIS, FRANCE - MAY 27: Diego Schwartzman of Argentina returns a shot during the men's singles match against Gael Monfils of France during day four of the 2015 French Open at Roland Garros on May 27, 2015 in Paris, France. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - MAY 27:  Diego Schwartzman of Argentina returns a shot during the men's singles match against Gael Monfils of France during day four of the 2015 French Open at Roland Garros on May 27, 2015 in Paris, France.  (Photo by Julian Finney/Getty Images)