On June 20, 1972, the 22-year-old WBA flyweight world champion, Masao Ohba (32-2-1, 13 KOs), faced Orlando Amores, in a title defense fight.
Ohba came in to the fight on a 16-fight win streak with a 37% KO rate, and was fighting after a gap of 3 months and 16 days.
Masao Ohba stopped Orlando Amores via KO in the 5th round of the 15-round world-title fight, and successfully defended his WBA flyweight title. Ohba improves his record to 33-2-1 (14 KOs)
On January 2, 1973, the 23-year-old WBA flyweight world champion, Masao Ohba (34-2-1, 15 KOs), faced Chartchai Chionoi, in a title defense fight.
Ohba came in to the fight on a 18-fight win streak with a 40% KO rate, and was fighting after a gap of 3 months and 7 days.
Masao Ohba stopped Chartchai Chionoi via KO in the 12th round of the 15-round world-title fight, and successfully defended his WBA flyweight title. Ohba improves his record to 35-2-1 (16 KOs)
On October 22, 1970, a 21-year-old Masao Ohba (25-2-1, 10 KOs) got a shot at the WBA flyweight title held by Berkrerk Chartvanchai.
Ohba came in to the fight on a 9-fight win streak with a 35% KO rate, and was fighting after a gap of 4 months and 1 day.
Masao Ohba stopped the champion via KO in the 13th round of the 15-round world-title fight, winning the first world title of his career, and is crowned the new WBA flyweight champion. Ohba improves his record to 26-2-1 (11 KOs)
On March 4, 1972, Masao Ohba and Susumu Hanagata met again in a rematch.
Ohba came in to the fight on a 15-fight win streak with a 38% KO rate, and was fighting after a gap of 4 months and 10 days.
Masao Ohba defeated Susumu Hanagata via majority decision in the rematch and successfully defended his WBA flyweight title. Ohba improves his record to 32-2-1
On April 1, 1971, the 21-year-old WBA flyweight world champion, Masao Ohba (27-2-1, 12 KOs), faced Betulio González, in a title defense fight.
Ohba came in to the fight on a 11-fight win streak with a 40% KO rate, and was fighting after a gap of 2 months and 11 days.
Masao Ohba defeated Betulio González via unanimous decision and successfully defended his WBA flyweight title. Ohba improves his record to 28-2-1
On October 23, 1971, the 22-year-old WBA flyweight world champion, Masao Ohba (30-2-1, 13 KOs), faced Fernando Cabanela, in a title defense fight.
Ohba came in to the fight on a 14-fight win streak with a 39% KO rate, and was fighting after a gap of 2 months and 4 days.
Masao Ohba defeated Fernando Cabanela via unanimous decision and successfully defended his WBA flyweight title. Ohba improves his record to 31-2-1
On January 21, 1971, a 21-year-old Masao Ohba (26-2-1, 11 KOs) and Fritz Chervet met in the ring.
Ohba came in to the fight on a 10-fight win streak with a 37% KO rate, and was fighting after a gap of 2 months and 30 days.
Masao Ohba stopped Fritz Chervet via TKO in the 8th round. Ohba improves his record to 27-2-1 (12 KOs)
On July 31, 1967, a 17-year-old Masao Ohba (6-1, 4 KOs) and Tadashi Nishikawa met in the ring.
Ohba came in to the fight on a 1-fight losing streak with a 57% KO rate, and was fighting after a gap of 1 month and 15 days.
Masao Ohba stopped Tadashi Nishikawa via KO in the 1st round. Ohba improves his record to 7-1 (5 KOs)
On June 17, 1968, an 18-year-old Masao Ohba (14-1-1, 8 KOs) and Shoichi Fujimaki met in the ring.
Ohba came in to the fight on a 5-fight win streak with a 50% KO rate, and was fighting after a gap of 1 month and 4 days.
Masao Ohba stopped Shoichi Fujimaki via KO in the 3rd round. Ohba improves his record to 15-1-1 (9 KOs)
On December 14, 1969, a 20-year-old Masao Ohba (22-2-1, 9 KOs) and Bernabe Villacampo met in the ring.
Ohba came in to the fight on a 6-fight win streak with a 36% KO rate, and was fighting after a gap of 3 months and 26 days.
Masao Ohba defeated Bernabe Villacampo via unanimous decision in the 10-round fight. Ohba improves his record to 23-2-1