In June 2014, Dudek tested positive for a banned substance following a Polish league match against Stal Gorzów. He was subsequently issued a 12-month ban by the FIM from all international speedway competitions, starting that August. The substance was later revealed to be Methylhexanamine, a drug commonly used as a dietary supplement. He returned to competition once his ban was lifted in August 2015.
In September 2016, during the Speedway Grand Prix Qualification he won the GP Challenge, which ensured that he claimed a permanent slot for the 2017 Speedway Grand Prix.[3] In 2017, he won the silver medal during the 2017 Speedway Grand Prix, having accomplished this during his debut season in the Speedway Grand Prix series, which makes him the most successful SGP rookie ever.
In July 2023, he was part of the Polish team that won the gold medal in the 2023 Speedway World Cup final. However, his World Championship campaign was inconsistent and he finished in 10th place.[7]