Novak Djokovic reasserted his dominance over fourth seed Taylor Fritz with a 6-3, 7-5, 3-6, 6-4 victory on Tuesday to set up a blockbuster US Open semi-final against Carlos Alcaraz.
The 38-year-old arrived at Arthur Ashe Stadium having beaten Fritz in all 10 of their previous meetings but had to battle hard at times to move past last year's runner-up and stay on track for a record 25th major title.
After a strong start, Djokovic came under intense pressure in the ninth game of the match and saved five breakpoints to close out the opening set on serve before a stunning crosscourt winner from deep sealed another tight hold in the next set.
Fritz, the last American man left in the draw, finally broke on his 11th attempt but failed to make the most of it and soon found himself two sets down.
The American showed great resolve to win the third set with improved serving but that was it for the comeback.
Djokovic held to love for a 5-4 lead in the fourth set and squandered two match points in the following game before closing it out to make it 16-0 against Americans at the US Open.
Earlier, second seed Alcaraz cruised into the US Open semi-finals on Tuesday, demolishing Czech Jiri Lehecka 6-4, 6-2, 6-4 on Arthur Ashe stadium.
Alcaraz has yet to drop a set at Flushing Meadows and he had the crowd in the palm of his hand as he fired off 28 winners and never faced a break-point.
Lehecka is one of the few players to beat Alcaraz this season, winning in the Doha quarter-finals, but was outclassed this time around and could only watch helplessly as the Spaniard's forehand winner zipped by on match point.
Alcaraz will play the winner of the match later on Tuesday between 24-times major winner Novak Djokovic and American fourth seed Taylor Fritz.
Alcaraz broke in the first game, helped on his way by a pair of Lehecka double faults, and the Spaniard got the crowd going as he triumphed in a thrilling, cat-and-mouse exchange at the net in the 10th game, sending a backhand winner streaking past the Czech.
The 2022 champion kept the momentum going in the second set, converting a break point at the net in the first game, and Lehecka became visibly agitated as he went down another break with a double fault in the seventh game.
Alcaraz smiled in disbelief as he nailed a series of precise shots to set up a break point in the seventh game of the final set, but Lehecka dug in to hold.
Alcaraz let out a triumphant cheer as he prevailed in a 12-shot rally on break point in the ninth game, and deployed his golf swing celebration to the delight of fellow Spaniard and 2017 Masters champion Sergio Garcia, who was in attendance.
The five-times major winner has only been broken once so far in the tournament, where he could retake the number-one ranking from Italian Jannik Sinner.
"It's really difficult not to think about it," he said. "If I think about the number one spot too much then I'm going to put pressure on myself and I don't want to do that."
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