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NEW YORK, NY - SEPTEMBER 04: Rafael Nadal of Spain celebrates defeating Alexandr Dolgopolov of Ukraine after their fourth round Men's Singles match on Day Eight of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NY - SEPTEMBER 04:  Rafael Nadal of Spain celebrates defeating Alexandr Dolgopolov of Ukraine after their fourth round Men's Singles match on Day Eight of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2017 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Clive Brunskill/Getty Images)