[1] He is a four-time Olympian for the Czech Republic, having competed in 2012, 2016,2020 and 2024 winning a silver medal in 2020.

He competed in the javelin throw at the 2012 Summer Olympics and placed 25th with a mark of 77.61 metres.

He reached the final at the 2016 Summer Olympics, taking eighth place, and took victory on the 2016 IAAF Diamond League circuit, with three wins and a personal best of 88.02 m (288 ft 9+1⁄4 in) in the process.

At the 2017 World Championships he set his new personal best, 89.73 m (294 ft 4+1⁄2 in), winning the silver medal.

[3][4] In November 2024 he was declared for the forth consecutive time, Czech Athlete of the year.