Jannik Sinner's title defense at the US Open is alive and well. The top-ranked player in the world had absolutely no issue whatsoever in his quarterfinal match at the grand slam on Wednesday night. He rolled past fellow Italian Lorenzo Musetti 6-1, 6-4, 6-2 to secure a spot in the semifinals. He'll now advance to take on Canada's Félix Auger-Aliassime on Friday, where a win will send him to a second straight championship match at the US Open. Sinner nearly blanked Musetti in the opening set, and started out 5-0 before finally dropping a game. Musetti simply couldn't get anything going. An in-form Jannik Sinner takes the first set 6-1.pic.twitter.com/D9QGznDDGr — US Open Tennis (@usopen)September 4, 2025 Though Musetti turned it on a little bit in the second — he won the first game, and kept things tight while taking a brief 4-3 lead — Sinner eventually took off. He won the last three straight games to seal the second set, which he did with a huge ace. Sinner's serve has been too much.He takes the second set 6-4.pic.twitter.com/Ta0emN5ptZ — US Open Tennis (@usopen)September 4, 2025 By then, Musetti was largely spent. Sinner cruised to the 6-2 win in the final set to close out his match in just under two hours. Sinner is attempting to win a second straight US Open this fall. He rolled over Taylor Fritz in straight sets in the championship match last season, which started a run in which he's been to every Grand Slam final since. Sinner beat Alexander Zverev in the Australian Open final in January, and he beat Carlos Alcaraz to win Wimbledon earlier this summer after Alcaraz got him at the French Open final. 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 take on Sinner.No. 2 Carlos AlcarazandNo. 7 Novak Djokovicwill meet in Friday's other semifinal.