On Monday, 8 September 2025, the rankings made it official. A day after beating Jannik Sinner, Carlos Alcaraz returned to No. 1. He lifted a second US Open title with a 6–2, 3–6, 6–1, 6–4 win. It is his sixth major and his first New York crown since 2022. Sinner’s 65-week stay at No. 1 ended with the Monday update.
How the final was won
Carlos Alcaraz dominated the opening set with first-strike aggression and purposeful serving. Jannik Sinner adjusted in set two, breaking once and stretching baseline exchanges. The third set swung back as Alcaraz reeled off 13 straight service points. He closed in four sets, improving his return depth and tempo between points. The decisive edge was his serve variety and cleaner forehand finishing under pressure.
The ranking math
The match doubled as a winner-takes-all showdown for No. 1. Sinner had led the rankings since 10 June 2024, spanning 65 straight weeks. Alcaraz’s victory triggered a Monday update restoring him to the summit. ATP preview notes confirmed the No. 1 stakes before the first ball. The outcome aligned with those scenarios, removing any ambiguity about the top spot.
A rivalry shaping the era
It was their third straight major final of the 2025 season. Alcaraz won Roland Garros after saving three championship points against Sinner. Sinner returned favour at Wimbledon before New York’s high-stakes decider. The head-to-head now tilts 10–5 in Alcaraz’s favour, per Tennis.com. This cadence mirrors classic duopolies, but with fresher legs and blistering pace.
The tournament numbers that mattered
Alcaraz lost serve only three times across the fortnight, a startling improvement. He had won 88 of his first 90 service games before the final. He faced only nine break points in that stretch, reflecting disciplined patterns. Those figures underpin the ranking flip more than any highlight reel. The serve upgrade turned tight patches into routine holds and pressure into poise.
The bottom line
He beat the defending champion 6–2, 3–6, 6–1, 6–4 on Sunday, 7 September. On Monday, 8 September, the ATP confirmed him as World No. 1 again. It is a second US Open, a sixth major, and a rivalry accelerant. The facts are sturdy; the implications are louder than any victory speech. Men’s tennis has a new leader again, and the calendar still has room.
