Nickname is Geronimo Speaks German, English and French Father, Ivan; mother, Jacqueline; siblings, Yael and Perrine Started playing tennis at age 3 when he found a racquet at his grandmother's home and asked what it was At age 6, began practisingat his hometown club in Mohlin At age 13, started practising with Swiss federation in Biel Credits Swiss Davis Cup captain Severin Luthi for being a great mentor Growing up, idolised countryman Roger Federer Favourite surfaces are hard and grass Favourite shot is forehand and tournament is Wimbledon Also enjoys football. Favourite teams are Paris SaintGermain and Liverpool Favourite athlete is basketball player LeBron James Secret talent is playing the drums Favourite superhero is Black Panther, movie is Focus,TV show is NCIS LA and actor is Tom Cruise Favourite food is Zurich-style veal with rosti. Guilty pleasure is chocolate Favourite subject in school was history Says that his best quality is having his own opinion, but his worst quality is biting his nails

Former World No. 5 junior began 2024 season as No. 485, then broke inside Top 300 in June and Top 200 in July, achieving career-high No. 123 in May 2025

Made tour-level debut at 2021 Davis Cup (d. Troost) and advanced to his 1st ATP Tour QF in Gstaad, becoming first Swiss quarter-finalist at that event since Wawrinka in 2013

Defeated compatriot Riedi to play in final qualifying round at 2024 US Open (lost to Halys in 3 sets), before defeating Wu Yibing to qualify for 2025 US Open and make his Grand Slam main draw debut

Owns 48-29 Challenger record (2-0 in finals), defeating No. 70 Nishioka in 2R en route to 2024 Prostejov title as No. 444-ranked Q and saving 7 MPs vs. Topo en route to 2024 Zug title on home soil

Started playing tennis at age 3 after finding a racquet at his grandmother’s home and credits Swiss Davis Cup captain Severin Luthi for being a great mentor

Ended junior career by advancing to 2021 US Open boys’ singles SF after reaching Wimbledon QF earlier that year