Masao Ohba vs. Chartchai Chionoi
1973-01-02 : Masao Oba 111¾ lbs beat Chartchai Chionoi 109¼ lbs by KO at 3:00 in round 12 of 15
- Location: Nihon University Auditorium, Tokyo, Japan
- Referee: Yusaku Yoshida 53-48
- Judge: Takeo Ugo 53-49
- Judge: Shoichi Kato 52-50
Ohba, dropped and on the verge of being stopped in the first round, slowly crawled back into the fight and finished the former champion with successive huge barrages of punches.
Ohba was killed in a motor accident only a few weeks after this career defining victory.