On June 20, 1975, Rubén Olivares and Bobby Chacon met again in a rematch.
Olivares came in to the fight on a 1-fight win streak with a 83% KO rate, and was fighting after a gap of 2 months and 13 days. Chacon was on a 7-fight win streak with a 88% KO rate, and fighting after a layoff of 3 months and 19 days.
Rubén Olivares made very easy work of Bobby Chacon in the rematch, stopping the champion via TKO in the 2nd. Olivares improves his record to 80-5-1 (72 KOs), while Chacon adds a loss to his record at 26-2.
On August 22, 1969, a 22-year-old Rubén Olivares (52-0-1, 50 KOs) got a shot at the undisputed bantamweight championship held by 21-year-old Lionel Rose (34-2, 8 KOs).
Olivares came in to the fight on a 25-fight win streak with a 94% KO rate, and was fighting after a gap of 1 month and 24 days. Rose was on a 22-fight win streak with a 22% KO rate, and fighting after a layoff of 2 months and 12 days.
Rubén Olivares stopped the champion via KO in the 5th round, winning the first world titles of his career, and is crowned the new WBA, WBC, and The Ring bantamweight champion. Olivares improves his record to 53-0-1 (51 KOs), while Rose adds a loss to his record at 34-3.
On December 12, 1969, the 22-year-old undisputed bantamweight world champion, Rubén Olivares (54-0-1, 52 KOs), faced a undefined Alan Rudkin undefined in an undisputed title defense fight.
Olivares came in to the fight on a 27-fight win streak with a 94% KO rate, and was fighting after a gap of 1 month and 15 days.
Rubén Olivares made very easy work of Alan Rudkin, stopping the challenger via TKO in the 2nd. Olivares improves his record to 55-0-1 (53 KOs)
On July 9, 1974, 27-year-old Rubén Olivares (75-4-1, 67 KOs) and Zensuke Utagawa fought for the vacant WBA featherweight title.
Olivares came in to the fight on a 3-fight win streak with a 83% KO rate, and was fighting after a gap of 1 month and 25 days.
Rubén Olivares stopped Zensuke Utagawa via KO in the 7th round of the 15-round world-title fight. Olivares improves his record to 76-4-1 (68 KOs)
On December 14, 1971, the 24-year-old undisputed bantamweight world champion, Rubén Olivares (68-1-1, 63 KOs), faced a undefined Jesús Pimentel undefined in an undisputed title defense fight.
Olivares came in to the fight on a 7-fight win streak with a 90% KO rate, and was fighting after a gap of 1 month and 19 days.
Rubén Olivares stopped Jesús Pimentel via TKO in the 11th round of the 15-round world-title fight, and successfully defended his WBA, WBC, and The Ring bantamweight titles. Olivares improves his record to 69-1-1 (64 KOs)
On April 2, 1971, a 24-year-old Rubén Olivares (62-1-1, 58 KOs) got a shot at the undisputed bantamweight championship held by Chucho Castillo.
Olivares came in to the fight on a 1-fight win streak with a 90% KO rate, and was fighting after a gap of 30 days.
Rubén Olivares defeated Chucho Castillo via unanimous decision in the rematch and wins the WBA, WBC, and The Ring bantamweight world champion — and becomes the undisputed bantamweight world champion. Olivares improves his record to 63-1-1
On April 18, 1970, the 23-year-old undisputed bantamweight world champion, Rubén Olivares (57-0-1, 55 KOs), faced a undefined Chucho Castillo undefined in an undisputed title defense fight.
Olivares came in to the fight on a 30-fight win streak with a 94% KO rate, and was fighting after a gap of 1 month.
Rubén Olivares defeated Chucho Castillo via unanimous decision and successfully defended his WBA, WBC, and The Ring bantamweight titles. Olivares improves his record to 58-0-1
On October 25, 1971, the 24-year-old undisputed bantamweight world champion, Rubén Olivares (67-1-1, 62 KOs), faced a undefined Kazuyoshi Kanazawa undefined in an undisputed title defense fight.
Olivares came in to the fight on a 6-fight win streak with a 89% KO rate, and was fighting after a gap of 2 months and 2 days.
In the rematch, Rubén Olivares stopped Kazuyoshi Kanazawa via TKO in the 14th round of the 15-round world-title fight, and successfully defended his WBA, WBC, and The Ring bantamweight titles. Olivares improves his record to 68-1-1 (63 KOs)
On April 28, 1978, a 31-year-old Rubén Olivares (83-9-1, 73 KOs) and a 19-year-old fellow Mexican boxer José Luis Ramírez (43-1, 36 KOs) met in the ring.
Olivares came in to the fight on a 1-fight win streak with a 78% KO rate, and was fighting after a gap of 4 months and 22 days. Ramirez was on a 22-fight win streak with a 81% KO rate, and fighting after a layoff of 2 months and 11 days.
Rubén Olivares stopped José Luis Ramírez via TKO in the 2nd round. Olivares improves his record to 84-9-1 (74 KOs), while Ramirez adds a loss to his record at 43-2.
On June 23, 1973, a 26-year-old Rubén Olivares (71-3-1, 65 KOs) and a 21-year-old American boxer Bobby Chacon (19-0, 17 KOs) met in the ring in a featherweight bout.
Olivares came in to the fight on a 1-fight win streak with a 86% KO rate, and was fighting after a gap of 1 month and 26 days. Chacon was on a 19-fight win streak with a 89% KO rate, and fighting after a layoff of 1 month and 26 days.
Rubén Olivares stopped Bobby Chacon via RTD in the 9th round. Olivares improves his record to 72-3-1 (66 KOs), while Chacon adds a loss to his record at 19-1.