Osamu Watanabe

Osamu Watanabe was a Japanese freestyle wrestler. In 1962, he debuted internationally and was the reigning world champion, when he capped off his career with a gold medal for Japan in freestyle wrestling at the 1964 Olympics, retiring from competition shortly afterwards as the only undefeated Olympic champion to date at 189–0. He is considered one of the best wrestlers in Olympic history.
In the early 2000s Watanabe resumed competing internationally in the masters category. He died of a heart attack on October 1, 2022.