NEW YORK, NY - SEPTEMBER 2 : Grigor Dimitrov of Bulgaria returns the ball to Gael Monfils of France (not seen) during men's singles fourth round match on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center in New York, United States on September 2, 2014. (Photo by Bilgin Sasmaz/Anadolu Agency/Getty Images)
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