Carrying hopes for U.S. men, Tiafoe reaches fourth round

Frances Tiafoe, of the United States, returns a shot to Marton Fucsovics, of Hungary, during the third round of the US Open tennis championships, Saturday, Sept. 5, 2020, in New York. (AP Photo/Frank Franklin II)

Frances Tiafoe, of the United States, reacts after winning a match against Marton Fucsovics, of Hungary, during the third round of the US Open tennis championships, Saturday, Sept. 5, 2020, in New York. (AP Photo/Frank Franklin II)

Frances Tiafoe reacted as though he had just won the U.S. Open, covering a grin with his hands in disbelief.