US Open Men Singles

Novak Djokovic, of Serbia, returns a shot to Kei Nishikori, of Japan, during the third round of the US Open tennis championships, Saturday, Sept. 4, 2021, in New York. (AP Photo/John Minchillo)
Novak Djokovic, of Serbia, returns a shot to Kei Nishikori, of Japan, during the third round of the US Open tennis championships, Saturday, Sept. 4, 2021, in New York. (AP Photo/John Minchillo)