Jannik Sinner, one of the rising stars of world tennis, is sharpening his game in Cincinnati with an eye on the upcoming US Open. Training alongside Brazilian teenager Joao Fonseca, Sinner is blending seasoned discipline with youthful energy to refine his preparation. Fonseca, known for his powerful groundstrokes and promising development, adds a dynamic dimension to the training sessions.
Darren Cahill’s guidance remains crucial
As always, Sinner’s coach Darren Cahill plays a central role in shaping his form and strategy. Cahill, a respected figure on the ATP tour, brings years of coaching expertise that continues to elevate Sinner’s tactical approach. Their collaboration has been marked by steady growth and a deepening understanding, and training in Cincinnati provides the perfect conditions to fine-tune the player’s performance against the backdrop of elite competition.
A unique training synergy
The interaction between Sinner, Fonseca, and Cahill reflects a synergy that blends experience, ambition, and technique. It’s not just about preparing for matches—it’s about expanding perspectives. Sinner’s decision to train with a younger talent shows a willingness to evolve, while Fonseca gains valuable insight from a top-10 player in his ascent through the ranks.
Eyes on the prize
As the hard-court season intensifies, Sinner’s presence in Cincinnati highlights his commitment to staying competitive and adaptable. With the US Open looming, this phase of training could become a pivotal piece in his journey toward greater achievements. His focus, the quality of his support team, and the unique training dynamic with Fonseca signal that he’s not merely maintaining form—he’s striving to reach new heights.
Jannik Sinner in 2025
Ranked no.1, Jannik played his last match on the 13th
of July when he defeated world no.2 Carlos Alcaraz 4-6 6-4 6-4 6-4 in the final in Wimbledon to win his 21st career title.Currently, during this year Sinner has an overall 26-3 record. Jannik conquered 2 titles in 2025 at the Australian Open and Wimbledon. Sinner was the runner-up in Rome and French Open.
Joao Fonseca in 2025
Ranked world no.49, the Brazilian played his last match on the 28th of July when he was defeated by world no.103 Tristan Schoolkate 7-6(5) 6-4 in the 1st round in Toronto (draw).
This year Joao has managed to achieve an overall 28-13 match record. Joao clinched 3 titles in 2025 in the Canberra Challenger, Buenos Aires and the Phoenix Challenger.
Jannik Sinner and Joao Fonseca have never squared off.