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NEW YORK, NY - SEPTEMBER 04: Rafael Nadal of Spain reacts against Lucas Pouille of France during his fourth round Men's Singles match on Day Seven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Steven Ryan/Getty Images)

NEW YORK, NY - SEPTEMBER 04:  Rafael Nadal of Spain reacts against Lucas Pouille of France during his fourth round Men's Singles match on Day Seven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Steven Ryan/Getty Images)