The last time Frances Tiafoe was playing a match inside Arthur Ashe Stadium, it was under the lights last year in front of a teeming crowd of 23,000, roaring with every point, as he tried to topple Carlos Alcaraz, the eventual U.S. Open champion and No. 1, in the semifinals.
Michelle Obama was sitting in the front row of the President’s Box, urging him on within earshot. There were N.B.A. players in the lower bowl, including Bradley Beal, then a star of Tiafoe’s beloved Washington Wizards, as well as a slew of Tiafoe’s friends and relatives lucky enough to land tickets for the biggest match an American man had played at the U.