Nickname is Lehy Father, Jiri, was a professional swimmer; mother, Romana, was professional track-and-field athlete; sister, Veronika Started playing tennis with his mother and grandfather Left home to begin training in Prostejov as a 15-year-old Favourite shot is forehand, surface is hard and city on tour is Kitzbuhel Lists Australian Open and US Open as his favourite tournaments Tennis idol is Roger Federer Favourite movie is Inception, TV show is Game of Thrones and actor is Leonardo DiCaprio Lists fish as his favourite food and sweet desserts as his guilty pleasure Favourite school subject was geography. ​ Biggest passions outside tennis include hiking, cycling and skiing. "I have the genes to be a sportsman," he says. "Sport is my passion all the way, up and down." Credits coach Michal Navratil and his mental coach for having the biggest impact on his career. "I've had a lot of emotions on the tennis court and I'm just trying to be more positive each day," he says. "They have helped me with that. Be more positive and go 100 percent, and with that, the success will come."

Achieved career-high No. 21 in August 2025 after 8-0 start to year after Brisbane title and run to Australian Open 4R

Defeated No. 5 Rublev to reach 2nd ATP Tour SF at 2023 Doha and en route to 1st ATP Masters 1000 QF at 2024 Indian Wells before defeating No. 4 Medvedev via RET to reach 1st ATP Masters 1000 SF at 2024 Madrid

In Australia, earned wins over No. 12 Norrie and No. 7 Auger-Aliassime en route to 2023 Australian Open QF and captured both ATP Tour titles at 2024 Adelaide and 2025 Brisbane

Reached 1st ATP Tour SF at 2022 Rotterdam as Q after defeating No. 12 Shapovalov in 1R for 1st ATP Tour win

Celebrated 21st birthday during 2022 Next Gen ATP Finals and finished as runner-up

Former World No. 10 junior won 2019 Wimbledon boys’ doubles title with countryman Forejtek