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NEW YORK, NY - SEPTEMBER 08: Jamie Murray of Great Britain and Bethanie Mattek-Sands of the United States celebrate match point during the mixed doubles final match against Alicja Rosolska of Poland and Nikola Mektic of Croatia on Day Thirteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Steven Ryan/Getty Images)

NEW YORK, NY - SEPTEMBER 08:  Jamie Murray of Great Britain and Bethanie Mattek-Sands of the United States celebrate match point during the mixed doubles final match against Alicja Rosolska of Poland and Nikola Mektic of Croatia on Day Thirteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2018 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Steven Ryan/Getty Images)