NEW YORK, NEW YORK - AUGUST 25: Gael Monfils of France practices with Stefanos Tsitsipas of Greece during the run up to the US Open at the USTA Billie Jean King National Tennis Center on August 25, 2021 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - AUGUST 25: Gael Monfils of France practices with Stefanos Tsitsipas of Greece during the run up to the US Open at the USTA Billie Jean King National Tennis Center on August 25, 2021 in New York City. (Photo by TPN/Getty Images)