Fifth seed Alexander Zverev defeated Borna Coric in four sets to reach the US Open semi-finals on Tuesday. The German overcame the 27th-seeded Croatian 1-6, 7-6 (7/5), 7-6 (7/1), 6-3 in 3hr 25min inside Arthur Ashe Stadium. Zverev, seeking a maiden Grand Slam title, will play Spain's 20th seed Pablo Carreno Busta, who overcame 12th seed Canadian Denis Shapovalov 3-6, 7-6, 7-6, 0-6, 6-3, for a place in the final.

Zverev, 23, said he stepped on the gas after finding himself a set down, and 4-2 behind in the second set. "I just started playing maybe a little bit more aggressive because if I would have played the way I played it's not the level for a quarter-final match of a Grand Slam," he said. "I just started playing better. I was a little bit more consistent and as well, my serve got better. "I thought to myself I'm down 6-1, 4-2, I have nothing to lose at the moment," Zverev added.