The match was tense from the first games. Sinner faced 10 break points and only lost one, showing steadfastness in the face of the Canady opponent's persistent play.
In set 2, Auger Aliassime played brilliantly, losing only one point when holding the ball and balancing the score at 1-1. At that time, Sinner also had to leave the pitch to treat a stomachache, which slowed down his delivery.
However, the Italian quickly regained his composure. He only made 4 self-defeating errors in set 3, before breaking the important game in set 4 to end the match with a score of 6-1, 3-6, 6-3, 6-4. This is Sinner's 300th career victory, and opens a dream confrontation with Carlos Alcaraz in the final.
This year's final will be of special significance as the number 1 ATP title will be decided. For the first time in the Open era, the two have appeared in all three Grand Slam finals in the same season. Alcaraz had previously beaten Sinner at Roland Garros and Cincinnati, while Sinner was crowned at Wimbledon.
Alcaraz is temporarily leading 9-5 in direct confrontation, and has won all three of his most recent meetings on hard courts. With current form, the US Open final promises to be a top competition, continuing the Grand Slam dominance streak of the 2 best young tennis players in the world.