NEW YORK, NY - AUGUST 22: Roger Federer practices before the start of the US Open at the USTA Billie Jean King National Tennis Centre on August 22, 2018 in New York City, United States. (Photo by TPN/Getty Images)
NEW YORK, NY - AUGUST 22: Roger Federer practices before the start of the US Open at the USTA Billie Jean King National Tennis Centre on August 22, 2018 in New York City, United States. (Photo by TPN/Getty Images)