In October 2022, Stump won the 2022 Abu Dhabi Grand Slam and he became the first Swiss judoka to win a Grand Slam tournament in the IJF World Tour.[10][11]
Stump won the gold medal in the men's 73kg event at the 2023 World Judo Championships held in Doha, Qatar.[5] He defeated Manuel Lombardo of Italy in his gold medal match.[5] He became the first Swiss judoka to win gold at the World Judo Championships.[5]