Achievements Competing in three Summer Olympics, he won two bronze medals in the K-2 1000 m event (1952, 1956). Wiedermann also won four medals at the International Coach Federation Canoe Sprint World Championships with a gold (K-2 10000 m: 1954) and three bronzes (K-1 4 x 500 m: 1950, 1954. K-2 500 m: 1950).