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NEW YORK, NY - SEPTEMBER 10: Rafael Nadal of Spain returns a shot against Kevin Anderson of South Africa during their Men's Singles finals match on Day Fourteen of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 10, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NY - SEPTEMBER 10:  Rafael Nadal of Spain returns a shot against Kevin Anderson of South Africa during their Men's Singles finals match on Day Fourteen of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 10, 2017 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Matthew Stockman/Getty Images)