Tiebreakers in the second and fourth sets propelled Canadian Félix Auger-Aliassime to a four-plus-hour victory over Australia's Alex de Minaur on Wednesday in the quarterfinals of the US Open. Knocking off a top-10 seed for the second time in the tournament, Auger-Aliassime again bounced back from a first-set defeat, this time to pull off a 4-6, 7-6(7), 7-5, 7-6(4) win. Auger-Aliassime, 25, and the former world No. 6, previously upset Germany's Alexander Zverev, the No. 3 seed, in the third round 4-6, 7-6(7), 6-4, 6-4. [Join or create a Yahoo Fantasy Football league for the 2025 NFL season] This is Auger-Aliassime's second time reaching the US Open semifinals after a run in 2021, when he lost to eventual champion Daniil Medvedev. This is also only the third time since 2022 that Auger-Aliassime has advanced beyond the second round in a Grand Slam tournament. The 27-year-old de Minaur, meanwhile, is still searching for his first semifinal appearance in a major. He has reached six such quarterfinals. Auger-Aliassime recorded almost three times as many aces (22) as de Minaur (8). Auger-Aliassime also hit 51 winners, 22 more than de Minaur. Those stats, however, don't tell the full story of a tightly contested match that featured an 87-minute second set, the longest set on the men's side of this year's US Open. The match twisted and turned, particularly in the fourth set when de Minaur broke Auger-Aliassime in the fourth game, only to be broken on four straight points in the ninth game. That misstep allowed Auger-Aliassime to eventually force a tiebreak, which included four double faults: two each from the players. Auger-Aliassime ultimately pulled away, punching his ticket to the semifinals, where he'll face the winner of Wednesday night's match between Italy's Lorenzo Musetti and Jannik Sinner. No. 2 Carlos AlcarazandNo. 7 Novak Djokovicwill meet in Friday's other semifinal.