Big twist in Jannik Sinner's coaching staff; Coach Darren Cahill takes break ahead of US Open 2025

As the last Grand Slam of the year approaches, Jannik Sinner trains without his longtime coach.

Jannik Sinner won the Australian Open, finished as runner-up at the French Open, claimed the Wimbledon title, and is now back in training for the final Grand Slam of the year, the US Open. However, this time the World No. 1 will take the field without his coach, Darren Cahill, who has reportedly taken a short break.

Coach Simone Vagnozzi will continue to work with the Italian star in Flushing Meadows, but he confirmed Cahill’s absence in an interview with Italy’s La Repubblica.

Meanwhile, Sinner’s long-time fitness trainer, Umberto Ferrara, is also expected to rejoin the team amid the US Open 2025 preparations.

Despite serving a three-month doping ban earlier this year, Jannik Sinner has had a phenomenal season already. He returned to the court after a 120-day hiatus and yet stunned everyone with a brilliant run at the Italian Open 2025, where he narrowly missed the title at home after losing to Carlos Alcaraz, who is now regarded as a clay-court master by many.

Also Read: Which top singles players are competing at the US Open 2025?

The World No. 1 made the best start to the season by winning the first major title of the year at the Australian Open 2025, defeating German star Alexander Zverev. He then reached the Roland Garros final, where his arch-rival Alcaraz claimed the trophy.

But Sinner got his revenge in a rematch of the French Open final at Wimbledon, winning his fourth Grand Slam.

Not to mention, Sinner’s rise to World No. 1 in June 2024 has been shaped under the guidance of Simone Vagnozzi and Darren Cahill, who have been coaching him since 2022. The coaching duo has a strong pedigree, having previously worked with former World No. 1s Lleyton Hewitt and Andre Agassi.

Vagnozzi spoke to ATP Tour in an interview about their strategy in building the 23-year-old to be the world’s best:

“In practice, we have different roles; I’m responsible for the more technical and tactical side of things, and Darren is more in charge of the mental and emotional aspects. Of course, we share everything, and the most important thing is that the player always hears one united voice.”

Together, the team has helped Sinner win four major titles, including his maiden Grand Slam title in Melbourne in 2024.

While Cahill’s absence from the US Open is confirmed, it’s still not confirmed whether he’ll join Sinner at the upcoming Cincinnati Open, where the World No. 1 is expected to compete.

Adding to the uncertainty is Cahill’s future. Though he had earlier hinted at retiring after this season, there are now signs he may continue coaching into 2026. However, no official confirmation has yet arrived.

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