NEW YORK — Frances Tiafoe kept coming back until he had reached his third US Open semifinal, beating Alex Michelsen 5-7, 3-6, 7-5, 6-3, 7-6 (10-6) on Tuesday. Frances Tiafoe, who lost the first two sets and then trailed 3-0 in the fifth, finally ended the match in 4 hours, 38 minutes Key points and original sources are listed below.

• NEW YORK — Frances Tiafoe kept coming back until he had reached his third US Open semifinal, beating Alex Michelsen 5-7, 3-6, 7-5, 6-3, 7-6 (10-6) on Tuesday. Tiafoe, who lost the first two sets and then trailed 3-0 in the fifth, finally ended the match in 4 h...S1

• Frances Tiafoe, who lost the first two sets and then trailed 3-0 in the fifth, finally ended the match in 4 hours, 38 minutesS2