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NEW YORK, NEW YORK - AUGUST 28: Roger Federer of Switzerland returns shot against Damir Dzumhur of Bosnia during their day 3 Men's Singles match of the 2019 US Open at the USTA Billie Jean King Tennis Center on August 28, 2019 in Queens borough of New York City. (Photo by Chaz Niell/Getty Images)

NEW YORK, NEW YORK - AUGUST 28: Roger Federer of Switzerland returns shot against Damir Dzumhur of Bosnia during their day 3 Men's Singles match  of the 2019 US Open at the USTA Billie Jean King Tennis Center on August 28, 2019 in Queens borough of New York City. (Photo by Chaz Niell/Getty Images)