Masao Ohba was a professional boxer. He became the WBA flyweight World Champion on October 22, 1970, defeating the reigning champion Berkrerk Chartvanchai in Tokyo and retained the championship for an impressive five title defenses. He died in a car accident at 23, still holding his world title. He was trained by Isamu Kuwata.

Teiken Boxing Gym (帝拳ボクシングジム) is a Japanese traditional boxing club based in the Kagurazaka neighborhood of Shinjuku, Tokyo, Japan. Dating back to 1926, Teiken Boxing Gym manages professional boxers as a member of the East Japan Boxing Association , a subsidiary body of Japan Pro Boxing Association . Its president is the International Boxing Hall of Famer Akihiko Honda , its representative is Tsuyoshi Hamada , and the long-time female manager is Haru Nagano . In order to distinguish from three related clubs i.e. Osaka Teiken Boxing Gym, Fukuoka Teiken Boxing Gym, and Hachinohe Teiken Boxing Gym, it is often referred to as "Teiken (Boxing) Gym in Tokyo" or "Tokyo's Teiken (Boxing) Gym".