On May 10 and 11, 2025, Joseph Mettler took part in the adh Trophy in sports boxing in Neubiberg. The event was hosted by the sports center of the Bundeswehr University Munich and offered numerous exciting fights in a rousing atmosphere.

Unfortunately, Joseph had to forfeit his own fight - he dropped his jab too often, allowing his opponent to get through several times with his right hand. Despite the defeat and longer waiting times, it was a valuable experience for Joseph.