No. 1 Sinner Meets Auger-Aliassime, and No. 2 Alcaraz Faces Djokovic in the US Open Semifinals

The 24-year-old from Italy also is coming off a Wimbledon championship in July for his fourth career major trophy.

Jannik Sinner, of Italy, returns a shot to Lorenzo Musetti, of Italy, during the quarterfinal round of the U.S. Open tennis championships in New York on Sept. 3, 2025. Adam Hunger/AP Photo

NEW YORK—Before knowing for sure that he would need to get past Jannik Sinner to reach a Grand Slam final for the first time, Felix Auger-Aliassime was asked to assess the U.S. Open’s No. 1 seed and defending champion.

“What to say about Jannik’s game?” said Auger-Aliassime, who is seeded 25th. “He’s been obviously untouchable, at times.”