Jannik Sinner locked the World No. 1 ranking ahead of the US Open after clinching his first Cincinnati Open title.
Sinner defeated first-time Masters 1000 finalist Frances Tiafoe in Monday's final and recorded 990 points to his tally to increase his lead over second-placed Novak Djokovic by 2300 points.
With the Serb set to defend 2000 points at the New York major, Sinner's position at the top of the rankings will not be under any threat during the tournament, regardless of his result.
Djokovic, who has not competed since the Olympics, was given a helping hand by the Italian in securing a top-two seeding at the final Grand Slam of the season. Sinner's marathon semifinal victory over Alexander Zverev in Cincinnati prevented the German from rising to World No. 2.
Therefore, Carlos Alcaraz retained the World No. 3 spot despite his shock defeat to Gael Monfils this past week. Zverev, meanwhile, will remain the fourth-ranked player ahead of former US Open champion Daniil Medvedev, who, surprisingly, has not won a title in 2024.
Andrey Rublev bridged the gap between himself and Medvedev as he fought to rise higher than sixth. Despite his absence from Cincinnati, Alex de Minaur kept his spot in the Top 10 as Stefanos Tsitsipas underperformed in the last Masters 1000 before the US Open.
There are plenty of changes outside the upper elite group. Ben Shelton (13th) made up one spot on Taylor Fritz (12th), and just a few points separated them heading to Flushing Meadows.
Tommy Paul drops to 14th, but Holger Rune, who was a game away from reaching the Cincinnati final, rises to 15th ahead of Sebastian Korda, ending the Americans' stranglehold on the Top 15 positions.
Frances Tiafoe is back in the Top 20. Thanks to an upturn in fortunes, he motors seven places to the 20th spot. Jack Draper rose to a new career-high ranking of No. 25 after reaching his second Masters 1000 quarterfinal last weekend.
Montreal champion Alexei Popyrin fell five places to 28th, although he is unlikely to lose a seeding spot at the US Open. Jiri Lehecka, who scored one of the best wins of his career in Cincinnati by knocking out Medvedev, leaped three places to 32nd.
Portugal's No.1 Nuno Borges moves to a new best ranking of No. 35, but it won't be sufficient for him to become a seed in New York. Adrian Mannarino exits the world's Top 40 after ten straight defeats.
American teenager Alex Michelsen tallied three wins (including two from qualifying) in Cincinnati and is now on the cusp of a Top 50 breakthrough (52nd). Roman Safiullin won the Cary Challenger last week and re-enters the Top 60 (59th).
Another big mover in the Top 100 is Damir Dzumhur, who also won a title in the ATP's second tier in Santo Domingo. The Bosnian climbs 19 places to 81st. Meanwhile, Laslo Djere (100th) rejoined the century club after reaching the semifinal at the same Challenger event.
With the Cincinnati Open concluding on Monday, the ATP rankings have been officially updated. You can track all your favorite players by visiting our ATP Rankings page.