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NEW YORK, NEW YORK - AUGUST 29: Cedrik-Marcel Stebe of Germany returns a shot during his Men's Singles second round match against Marin Cilic of Croatia on day four of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2019 in Queens borough of New York City. (Photo by Mike Stobe/Getty Images)

NEW YORK, NEW YORK - AUGUST 29: Cedrik-Marcel Stebe of Germany returns a shot during his Men's Singles second round match against Marin Cilic of Croatia on day four of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2019 in Queens borough of New York City. (Photo by Mike Stobe/Getty Images)