It’s Sunday evening, a little after 6 o’clock, and Coco Gauff is going through her postmatch routine in the section of the Billie Jean King National Tennis Center where players warm up before matches and cool down after them.
Two other stars of American tennis, Frances Tiafoe and Ben Shelton, who are among her close friends, are there, too. Tiafoe is winding down after his fourth-round U.S. Open win, which set up his all-American quarterfinals match against Shelton, who is getting ready to play a mixed doubles match. The friendly trash talk has begun, and Gauff cannot resist being involved.