The 22-year-old Spaniard claimed a 6-2, 3-6, 6-1, 6-4 victory, securing his second US Open trophy and sixth Grand Slam overall.
The win was especially sweet for Caelos Alcaraz, who avenged his loss to Sinner in July’s Wimbledon final, which was his only defeat in a Grand Slam title match.
With this triumph, Alcaraz climbs back to the top of the ATP rankings, overtaking Sinner and regaining the No. 1 position for the first time in a year.
His victory also ended Jannik Sinner’s remarkable 27-match unbeaten streak at hard-court majors.
“I tried my best today. I couldn’t do more,” Sinner admitted after the match.
The Italian has now fallen short in back-to-back Slam finals against Alcaraz, including a five-set marathon at Roland Garros in June.
Sinner’s loss also extends a striking Open-era trend, which no man has successfully defended the US Open men’s title since Roger Federer’s five-year streak from 2004 to 2008.
Fresh from appearances at the Super Bowl in February and the FIFA Club World Cup in July, President Donald Trump arrived at Arthur Ashe Stadium before the U.S. national anthem, waving to the crowd.
While some applauded, louder boos rang out, and when the president was shown again later on the big screen, the reception grew even colder.
A number of celebrities also watched from the stands, including Bruce Springsteen, Tommy Hilfiger, Michael Douglas, and NBA star Stephen Curry.
Heightened security meant fans waited longer to get inside, delaying the start of the match by half an hour.
Even then, the stadium was not full when Alcaraz broke Sinner’s serve in the opening game, quickly racing to a 5-2 lead before closing the first set with ease.
Sinner rallied in the second, breaking early to level the contest at one set each, but Alcaraz struck back in the third. The Spaniard electrified the crowd with a brilliant running forehand smash as he built a commanding 3-0 lead, eventually dominating the set.
In the fourth, Sinner fought hard to stay alive, saving break points early, but Alcaraz broke through in the fifth game and never let go of control.
He sealed the win in just over three hours, joining an exclusive group of men to win multiple Grand Slams across all three surfaces, including hard court, grass, and clay.
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