Coach Darren Cahill Explains Jannik Sinner’s Different Off-court Personality After Wimbledon Victory over Carlos Alcaraz: “Not the Same Guy”
World No.1 Jannik Sinner lifted the second title of the season at Wimbledon, following the Australian Open.

Darren Cahill, Jannik Sinner (Image via X/Jannik Sinner HQ)
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It’s uncertain whether Darren Cahill will still be working with Jannik Sinner after this year. Sinner, during his Australian Open campaign this year, had revealed that Cahill will no longer be working with him after this year.
But Sinner has won a bet. Before the final, Cahill told him if he won Wimbledon, it would be up to him to keep him in his entourage or not.
Under Cahill, and coach Simone Vagnozzi, Sinner has achieved incredible results- won four Grand Slam titles, the 2024 ATP Finals, and reached the No.1 rankings. Sinner has spent a considerable amount of time in their company as both of them joined the youngster’s team in 2022.
Following Sinner’s 4-6, 6-4, 6-4, 6-4 victory over Alcaraz in the Wimbledon final, Cahill talked about Sinner’s on and off-court personality. Cahill said Sinner is a fun-loving person off the court but during matches, he turns himself into something else.
I speak about his parents all the time and his upbringing and his grounded upbringing…the way he treats the people around him. He’s a good man. He’s a good young fellow. Always has a smile on his face. The person you see on the tennis court, this focus, this attention to detail…he’s not the same guy off the court.
Darren Cahill said at the press conference
Sinner has become the first Italian player to capture the Wimbledon crown in the Open Era. It was Sinner’s first victory over Alcaraz after five consecutive defeats, which included the French Open final.
He’s a fun-loving guy who’s joking around all the time that just loves the company of the people around him. He’s cooking. He’s messing up stuff. He’s making mistakes all over the place. We’re laughing about it. It’s a good group of people. He has fun like any other 23-year-old has. But he has the mentality on a tennis court that is special.
Darren Cahill added
Sinner has now two grass-court titles under his belt. Last year, he beat Hubert Hurkacz to win the Halle Open, which he failed to defend this year because of his defeat to eventual winner Alexander Bublik in the second round. The 23-year-old has become the second Italian man to win multiple titles on grass after Matteo Berrettini.
Jannik Sinner takes a playful jibe at his brother after his Wimbledon win
Because there was no Formula 1 race, Jannik Sinner‘s brother Mark Sinner watched him play from the stands of the Centre Court. When Sinner played the Italian Open final with Carlos Alcaraz, Mark was not in Rome to cheer for his brother.

He instead was in Imola watching Formula 1. Sinner took a playful dig at him for choosing Formula 1 over him. But this time, Mark received a special from the now four-time Grand Slam champion.
Special thanks to my brother because there’s no Formula 1 race this weekend. That’s why he’s here.
Jannik Sinner said during the trophy presentation
Jannik Sinner after beating Carlos Alcaraz to win Wimbledon
— The Tennis Letter (@TheTennisLetter) July 13, 2025
“Special thanks to my brother because there’s no Formula 1 race this weekend. That’s why he’s here” 💀💀💀💀 pic.twitter.com/iTMAzo0uuM
Sinner has extended his record for most Grand Slam titles won by an Italian man. He has improved his head-to-head record over the five-time Grand Slam champion to 5-8.
Alcaraz was aiming to become the fifth man in the Open Era to win three Wimbledon titles on the trot and join Bjorn Borg, Pete Sampras, Roger Federer, and Novak Djokovic. He was also bidding to become the second man after Borg to win the French Open and Wimbledon for consecutive seasons.
Sinner, who has now reached every Grand Slam final, needs the French Open trophy to complete the Career Grand Slam. Only the Australian Open title has eluded Alcaraz as there, he hasn’t yet progressed beyond the quarterfinals.
Also read: (Video) Jannik Sinner hits Ridiculous Tweener Against Carlos Alcaraz in the Wimbledon Final