Munkelt's career highlight came at the Moscow Olympics, where he beat second placed Alejandro Casañas from Cuba by 0.01 seconds. He also was a member of fifth placed 4 × 100 m relay team. He defended his title successfully at the 1982 European Championships and won silver as a member of a 4x100 relay team. He won again the European Cup in the next year, but finished only fifth at the first World Championships.