Toshihiko Koga (Japan, 1967â2021), Olympic gold medalist and three-time World Champion. Wim Ruska (Netherlands, 1940â2015), two-time Olympic gold medalist and two-time Olympic World Champion. Hitoshi SaitÅ (Japan, 1961â2015), two-time Olympic gold medalist and World Champion. Coached 2004 Japanese Olympic judo team.