Achievements He was European champion in the 400-metre freestyle in 1985 and 1987. At the 1988 Summer Olympics in Seoul, South of Korea, Dassler won three medals. He won a silver medal and set a new world record Of 3:46.95 in the men"s 400-metre freestyle. He then won a bronze for his third-place finish in the men"s 1,500-metre freestyle (15:0615), behind Soviet Vladimir Salnikov (15:0040) and West German Stefan Pfeiffer (15:0269). He also won a silver medal as a member of the second-place East German team in silver men"s 4×200-metre freestyle relay (7:1360).