Who is Jannik Sinner’s Brother?

Jannik Sinner is an Italian tennis player who was born on August 16, 2001. He holds the No. 1 spot in the ATP rankings in singles as of September 2025. Sinner won his first major championship at the 2024 Australian Open, defeating world No. 1 Novak Djokovic and then Daniil Medvedev in a five-set final. To end the year as the top-seeded player in the world, he went on to win three Masters 1000 titles, the US Open, and the ATP Finals.

Sinner was trained by Riccardo Piatti when he started to focus on tennis at the age of thirteen. He also started collaborating with Massimo Sartori and Andrea Volpini at that time. He kept working with Volpini as his backup coach and Piatti as his head coach. Claudio Zimaglia, a physiotherapist, and Dalibor Širola, a fitness coach, also made up his squad. He ceased working with Piatti and his staff in February 2022 and started training with physiotherapist Simone Vagnozzi, Marco Cecchinato's former coach, and Umberto Ferrara, who had recently taken over as fitness coach.

Does Jannik Sinner Have a Brother?

Yes, Jannik Sinner has an older brother, Mark Sinner. Marc, the older brother of Jannik Sinner, is an avid Formula One enthusiast. According to the Italian publication Il Messaggero, Sinner's parents adopted Mark soon after his birth in 1998.

Although the two brothers get along well and Mark says they play golf whenever Jannik's hectic schedule permits, he ended up missing Jannik's Italian Open final matchup with Carlos Alcaraz because he was in Imola for a Formula One event. Sinner joked about the issue in his on-court interview after the game. (via Il Messaggero)

Mark Sinner Nationality

Like his brother Jannik Sinner, Mark Sinner is an Italian who was born in the German region of Italy.

Mark Sinner Social Media

Mark Sinner is available on Instagram on the handle @captain_magma

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