Novak Djokovic set up a titanic US Open semi-final with Carlos Alcaraz on Tuesday as the Serbian star kept his bid for a record 25th Grand Slam firmly on track.

The 38-year-old Djokovic advanced to a record-equalling 14th US Open semi-final with a four-set win over fourth seed Taylor Fritz, eliminating the last American in the men's draw.

Djokovic's 6-3, 7-5, 3-6, 6-4 victory saw him improve to 16-0 against US opponents in New York as he reached the last four of a major for the 53rd time.

"It was an incredibly close match. It was really anybody's match," said Djokovic, who also drew level with Jimmy Connors for the most US Open semi-final appearances.

"I thought I was really lucky to save some crucial break points in the second set. I think for most of the second and third sets he was

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