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NEW YORK, NY - SEPTEMBER 02: Rafael Nadal of Spain (R) shakes hands with Leonardo Mayer of Argentina after defeating him in their third round match on Day Six of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NY - SEPTEMBER 02:  Rafael Nadal of Spain (R) shakes hands with Leonardo Mayer of Argentina after defeating him in their third round match on Day Six of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2017 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Clive Brunskill/Getty Images)