Jannik Sinner vs Félix Auger-Aliassime Best Bet & Prediction, US Open – September 5, 2025
The US Open semifinal stage is set, and Friday night will feature a fascinating showdown between world No. 1 Jannik Sinner and resurgent Felix Auger-Aliassime of Canadian. Both players arrived in New York City with contrasting narratives – Sinner looking to consolidate his dominance at the top of the men’s game, and Auger-Aliassime finally reviving his long-questioned potential with a remarkable late-summer surge.
The winner will advance to Sunday’s championship match to face either Carlos Alcaraz or Novak Djokovic, ensuring another blockbuster final at Arthur Ashe Stadium.
Jannik Sinner: The Relentless No. 1 Chasing History
If there is one theme to Jannik Sinner’s 2025 season, it is consistency at the very highest level. Still only 24 – he turned last month, the Italian has already rewritten records this year. His run to the US Open semifinals makes him the youngest world No. 1 in history to reach four Slam semifinals in a single season, surpassing greats like Roger Federer, Novak Djokovic, and Ivan Lendl.
Sinner might have missed the opportunity to pursue the Calendar Slam after falling to Carlos Alcaraz in the French Open final, but his dominance remains striking. In Flushing Meadows, he has bulldozed his way through the draw, opening three of his five matches with 6-1 sets – a trademark sign of his ruthless starts. Across the fortnight, he has produced six bagel or breadstick sets (6-0/6-1), showing no let-up regardless of opponent.
What makes Sinner particularly dangerous is his semifinal streak. Since his defeat to Alcaraz at last year’s French Open, the Italian has strung together 11 consecutive semifinal wins on ATP tour, converting each into a final. On hard courts, he has not fallen to a non-top-20 opponent since a loss to Dusan Lajovic in the second round of the Cincinnati Masters in 2023, and in Grand Slam events, he has been almost untouchable outside of meetings with Alcaraz.
The defending US Open champion has already made history in New York once – last year, he became the first Italian man to win the The Big Apple Slam. Now, he’s attempting to do something no player has managed since Roger Federer in 2008: defend the men’s title at Flushing Meadows.
Felix Auger-Aliassime: The Long-Awaited Resurgence
On the other side of the net, Felix Auger-Aliassime arrives as the underdog but with arguably the story of the tournament. Written off for much of the past two years due to stagnation, inconsistency, and mounting pressure, the Canadian has finally rediscovered the spark that once made him one of the sport’s brightest young stars.
Just weeks ago, few would have picked him to make the semifinals. He had a disastrous Canadian Open, falling in the opening round in Toronto, and his Grand Slam record over the past year was bleak – just two total wins across the first three majors of 2025.
But New York has changed everything. The 25-year-old Canadian delivered the best Slam run of his career since 2021, defeating world No. 3 Alexander Zverev in the third round – his first-ever top-five win at a major (previously 0-6). He backed it up with a four-set victory over Andrey Rublev before stunning 8th seed Alex de Minaur in the quarterfinals. His performances have been a mix of aggression, resilience, and renewed confidence, qualities long missing from his game.
This is only his second Grand Slam semifinal – the first also came at the US Open in 2021, when he lost to eventual champion Daniil Medvedev. This time, however, he has beaten three Top 15 players (Sascha Zverev, Alex de Minaur and Andrey Rublev) to get here and will return to the ATP Top 15 regardless of Friday match’s outcome.
Head-to-Head (H2H: Sinner vs Auger Aliassime): Canadian Leads, But Context Matters
Surprisingly, Felix Auger-Aliassime holds a 2-1 head-to-head lead over Jannik Sinner, a reminder of his early promise when their careers briefly intersected. Yet, the dynamic has changed dramatically in the past two years. Sinner has transformed into a ruthless No. 1, while Felix has been fighting to regain lost ground.
Their clash in the semifinals will mark the first meeting between them on a Grand Slam stage. On paper, Sinner’s baseline consistency, return game, and current form put him in a different league. Still, Auger-Aliassime’s raw shot-making ability and newly regained confidence could at least test the Italian in ways many others have not.
Betting Prediction and Odds
Sinner enters as the heavy favorite, and rightly so, given his dominance in New York and his near-perfect Slam consistency over the last 18 months. Even the market reflects how unlikely an upset is, with the Italian priced at -3333.
That said, the value lies in the total games market. Auger-Aliassime has beaten three seeded players in a row and shown the resilience to hang tough, even when the odds were stacked against him. While a straight-sets Sinner victory is the likeliest outcome, a competitive three-setter with tiebreaks or a four-set match is more than plausible.
Jannik Sinner should advance, but Auger-Aliassime has enough confidence and firepower to push the world No. 1 into at least one extended set. Expect the Italian to extend his remarkable semifinal streak and move one step closer to defending his Flushing Meadows crown. But don’t expect Auger-Aliassime to go quietly – his rediscovered confidence makes him a dangerous opponent who could force Sinner into longer sets.