Matjuszonok came to prominence after reaching the final series of the
2018 Speedway Under-21 World Championship, aged just 16 and winning his first silverware after securing a bronze medal at the
European Junior Team Championships. In 2020, he won another bronze medal at the
2020 Team Speedway Junior European Championship and repeated his success of 2018 and 2020 by winning a third bronze medal during the
2021 European Under 23 Team Speedway Championship. Matjuszonok finished in sixth place in the
2021 Individual Speedway Junior European Championship and also in 2021, Matjuszonok, riding with riding partners
Francis Gusts and
Ričards Ansviesulis, won the European U19 pairs title. He made his
Speedway Grand Prix (World Championship) debut during the
Speedway Grand Prix of Latvia as a track reserve in the
2023 Speedway Grand Prix. Also in 2023, Matjuszonok won the bronze medal at the
U21 World Team Championships at the
2023 Speedway of Nations 2. == References ==