German fifth seed Alexander Zverev fought back from a set down to reach his first US Open semi-final by beating a battling Borna Coric.
Zverev, 23, crumbled in the first set as the Croatian 27th seed threatened his hopes of a first Grand Slam title.
But two impressive tie-breaks and a late break in the fourth set gave the German a 1-6 7-6 (7-5) 7-6 (7-1) 6-3 victory.
“I started playing a bit more aggressively,” Zverev said.
“The way I was playing was not the level for a Grand Slam quarter-final. I don’t want to stop here.
“It’s great to be in the semi-finals. I hope that I can continue going the way I am.”
Zverev will play Spanish 20th seed Pablo Carreno Busta or Canadian 12th seed Denis Shapovalov next. Their quarter-final takes place later on Tuesday. (BBC)