NEW YORK, NEW YORK - AUGUST 31: : Novak Djokovic of Serbia returns a volley during his Men's Singles first round match against Damir Dzumhur of Bosnia and Herzegovina on Day One of the 2020 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2020 in the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
