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NEW YORK, NY - SEPTEMBER 08: Kevin Anderson of South Africa returns a shot against Pablo Carreno Busta of Spain during their Men's Singles Semifinal match on Day Twelve of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Abbie Parr/Getty Images)

NEW YORK, NY - SEPTEMBER 08:  Kevin Anderson of South Africa returns a shot against Pablo Carreno Busta of Spain during their Men's Singles Semifinal match on Day Twelve of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2017 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Abbie Parr/Getty Images)