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NEW YORK, NY - SEPTEMBER 4: Rafael Nadal of Spain reacts against Fabio Fognini of Italy during their Men's Singles match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the neighborhood of the Queens borough of New York City. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)

NEW YORK, NY - SEPTEMBER 4: Rafael Nadal of Spain reacts against Fabio Fognini of Italy during their Men's Singles match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the neighborhood of the Queens borough of New York City. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)