Novak Djokovic defeated Daniil Medvedev in straight sets on Sunday to win his fourth US Open and a record-equalling 24th Grand Slam singles title, cementing his claim as the greatest tennis player in history.

Novak Djokovic defeated Daniil Medvedev in straight sets on Sunday to win his fourth US Open and a record-equalling 24th Grand Slam singles title, cementing his claim as the greatest tennis player in history.

The 'Big Three' dominated men's tennis over the last two decades with a collective 66 Grand Slam titles between them but Djokovic is now clear of the retired Federer (20) and Nadal (22), who is expected to call time on his career next year

"I thought about doing this t-shirt a few days ago," said Djokovic. "I didn't share it with anybody. Kobe was a close friend of mine, we chatted a lot, about the winner's mentality."

The 36-year-old Serb becomes the oldest U.S. Open men’s winner in the Open Era and the first to win three Grand Slam events in a season for the fourth time.

Gauff, 19, produced a gutsy performance on the Arthur Ashe Stadium court to win 2-6, 6-3, 6-2 in 2hr 6min to complete a fairytale transformation in her season's fortunes.

Novak Djokovic earned himself another shot at a record-equalling 24th Grand Slam title after beating unseeded American Ben Shelton in straight sets on Friday to advance to his 10th US Open final.

Daniil Medvedev upset defending champion Carlos Alcaraz in an enthralling semi-final duel to reach the US Open final on Friday.

Aryna Sabalenka fought back from the brink of defeat to overcome American 17th seed Madison Keys in a third-set tie-break and line up a US Open final against home favourite Coco Gauff.

The US Open was plunged into chaos on Thursday after environmental activists disrupted play, forcing a 49-minute stoppage as the tennis showpiece became the latest high-profile sporting event to be targeted by protesters.

American teenager Coco Gauff shrugged off a 50-minute stoppage caused by climate protesters to power into the US Open final on Thursday with a straight sets defeat of Karolina Muchova.

Defending champion Alcaraz moved to within one win of a potential dream final with Novak Djokovic with an emphatic straight sets victory over German 12th Alexander Zverev.

New York has been sweltering in a heatwave this week, with high humidity and temperatures at Flushing Meadows on Wednesday hitting 35 degrees Celsius (95 Fahrenheit)

Djokovic shrugged off ninth seed Fritz 6-1, 6-4, 6-4 to extend his dominance of American players in New York and take another step closer to a record-extending 24th men's Grand Slam title.

Daniil Medvedev expects his US Open quarterfinal with fellow Russian Andrey Rublev on Wednesday to be a real fight but said nothing will come between the childhood friends once the dust has settled.

Defending champion Alcaraz, who has only dropped one set on his journey into the last eight, produced a dominant display to overwhelm Italian world No.61 Matteo Arnaldi, winning 6-3, 6-3, 6-4 in 1hr 57min.

Defending champion Iga Swiatek was sent crashing out of the US Open on Sunday, losing in three sets to Latvia's 20th seed Jelena Ostapenko.

Third seed Daniil Medvedev worked the U.S. Open graveyard shift again on Saturday beating in-form Sebastian Baez 6-2, 6-2, 7-6(6) to end the Argentine's 12-match winning streak and ease into the fourth round of the season's final Grand Slam.

Alcaraz, looking to become the first man to successfully defend the title since Roger Federer in 2008, polished off British 26th seed Dan Evans 6-2, 6-3, 4-6, 6-3 in 3hr 11min

A tenacious Novak Djokovic survived a US Open late-night fright battling back from two sets down to tame fellow Serb Laslo Djere 4-6, 4-6, 6-1, 6-1, and 6-3 on Friday, and move into the fourth round at Flushing Meadows.