After handing his fellow American a crushing defeat in the US Open quarterfinals Tuesday, Frances Tiafoe held Alex Michelsen in a long embrace while the 22-year-old sobbed on his shoulder.

Frances Tiafoe pulled off the biggest comeback of the US Open. Then he helped produce one of the best moments of the US Open.

Tiafoe had just completed an all-time epic comeback against world No. 46 Alex Michelsen, who was playing in his first-ever Grand Slam quarterfinal. After dropping the first two sets, Tiafoe punched back in the third and fourth sets to force a winner-take-all tiebreaker in the fifth.

Frances Tiafoe kept coming back until he had reached his third US Open semifinal, beating fellow American Alex Michelsen 5-7, 3-6, 7-5, 6-3, 7-6 (10-6) on Tuesday.

Frances Tiafoe rallied from two sets down -- and 3-0 down in the fifth set -- to edge 22-year-old Alex Michelsen 5-7, 3-6, 7-5, 6-3, 7-6 (10/6) and reach the US Open semi-finals on Tuesday.But in a match of swinging momentum shifts,

Follow live as the singles quarterfinals get underway at Flushing Meadows.

Para alcanzar su tercera semifinal del Abierto de Estados Unidos, Frances Tiafoe debió remontar una y otra vez.