"He's a competitive animal," Cahill discusses his collaboration with Sinner

For several years now, Darren Cahill has been Jannik Sinner’s coach. Under the guidance of the Australian, alongside Simone Vagnozzi, the Italian has reached new heights, eventually becoming the best player in the world.
With four Grand Slam titles to his name, Sinner has held onto his world No. 1 ranking since ascending to the throne in June 2024 after Roland-Garros a year ago. Cahill, 59, reflected on Sinner’s evolution over the past three years.
"As coaches, we are very proud because all the work done over the last three years is now showing in matches and big tournaments, allowing him to go all the way and win. It doesn’t take just four or five days to make major changes in a player.
"It’s the result of one or two years of pushing him day after day and making sure we keep working on every aspect. One thing I told him from the very beginning of our collaboration was: ‘Your serve has to improve.
"You’re 1.90m tall and a strong guy. You need to be able to increase the speed of your first serve and improve its placement. That way, you’ll start winning free points with your first serve.
"If, on the other hand, others manage to neutralize your serve, you’ll have to work much harder to earn your points.’ Then, the questions started pouring in, one after another... That’s typical of him. He wants to compete.
"He’s a competitive animal. Right now, we’re witnessing an incredible level of tennis, with Carlos Alcaraz and Jannik," Cahill told Tennis World Italia in recent hours.