Boris Becker praises Jannik Sinner’s coaches for fixing the ‘missing’ area of his game after the US Open final

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Jannik Sinner came up short in the US Open final, losing to his greatest rival, Carlos Alcaraz.

The Italian was looking to win his third Grand Slam of the year, but fell in four sets to the Spaniard.

Sinner’s serve was poor in the final, while Alcaraz’s was excellent, as the shot played a significant role in the outcome of the match.

He vowed to make changes to his game in the aftermath of the US Open final, and by all accounts, it seems like he has successfully done so.

Weighing in with his thoughts, tennis legend Boris Becker highlighted the biggest change he’s noticed in Sinner recently, praising his coaches Darren Cahill and Simone Vagnozzi for their work.

Boris Becker says Jannik Sinner’s coaches did a ‘fantastic job’ fixing his serve

During an interview with La Gazzetta dello Sport, Becker shared his thoughts on the world number two.

“I think Simone Vagnozzi and Darren Cahill did a fantastic job after the US Open to improve Jannik’s serve,” he said.

“That was the shot he was missing in the summer, especially in the New York final.”

Serving stats from the 2025 US Open final

“In my opinion, [Carlos] Alcaraz was the better player, but also the better server.

“The serve is the only shot your opponent doesn’t play into; it’s completely in your hands.”

Becker believes Sinner’s serve has improved since the US Open, allowing him to enjoy even more success on the ATP Tour.

“Jannik has changed his technique a bit; even his toss is different,” he said.

“The big difference between the Sinner of the summer and the one now is his serve, and indoors, that’s a huge factor.”

Since the US Open, Sinner has won 19 of the 20 matches he’s played, picking up three titles.

Jannik Sinner’s record post-US Open

• 2025 China Open 1R [WIN] vs Marin Cilic
• 2025 China Open 2R [WIN] vs Terence Atmane
• 2025 China Open QF [WIN] vs Fabian Marozsan
• 2025 China Open SF [WIN] vs Alex de Minaur
• 2025 China Open F [WIN] vs Learner Tien
• 2025 Shanghai Masters 2R [WIN] vs Daniel Altmaier
• 2025 Shanghai Masters 3R [LOSS] vs Tallon Griekspoor
• 2025 Vienna Open 1R [WIN] vs Daniel Altmaier
• 2025 Vienna Open 2R [WIN] vs Flavio Cobolli
• 2025 Vienna Open QF [WIN] vs Alexander Bublik
• 2025 Vienna Open SF [WIN] vs Alex de Minaur
• 2025 Vienna Open F [WIN] vs Alexander Zverev
• 2025 Paris Masters 2R [WIN] vs Zizou Bergs
• 2025 Paris Masters 3R [WIN] vs Francisco Cerundolo
• 2025 Paris Masters QF [WIN] vs Ben Shelton
• 2025 Paris Masters SF [WIN] vs Alexander Zverev
• 2025 Paris Masters F [WIN] vs Felix Auger-Aliassime
• 2025 ATP Finals RR [WIN] vs Felix Auger-Aliassime
• 2025 ATP Finals RR [WIN] vs Alexander Zverev
• 2025 ATP Finals RR [WIN] vs Ben Shelton

He could yet add another title to his 2025 collection in Turin, as he heads into the semifinals of the ATP Finals, where he will take on Alex de Minaur.

Then Sinner will turn his attention to the 2026 Australian Open…

Jannik Sinner’s Grand Slam record is ‘not talked about enough’ – Boris Becker

Becker believes Sinner’s efforts at the four major tournaments have somehow gone under the radar.

“I think the fact that Sinner reached the final of all four Slams has gone a bit under the radar. It’s an incredible achievement,” he said.

“He lost Paris and New York, but reaching the final of four consecutive Majors—actually five, if we count the US Open last year—is something extraordinary, and it’s not talked about enough.”

Since the beginning of the 2024 season, Sinner has played six of eight major finals, winning four.

Jannik Sinner’s Grand Slam record since 2024

He’ll no doubt return to Melbourne as a hot favorite to defend his title again in 2026.

Sinner will begin his Australian Open title defence when the tournament starts on Monday, January 12.