In July 2015, Vetter took part in the European U23 Championships. He finished fourth, throwing the javelin 79.78 m. Kacper Oleszczuk won gold with a throw of 82.29 m. In August 2015, he competed in the IAAF World Championships. He finished seventh with a throw of 83.79 m. Julius Yego won the competition with a throw of 92.72 m.