On September 26, 1986, a 23-year-old Edwin Rosario (28-2, 24 KOs) got a shot at the WBA lightweight title held by 26-year-old St. Kitts & Nevis boxer Livingstone Bramble (24-1-1, 15 KOs).
Rosario came in to the fight on a 1-fight losing streak with a 80% KO rate, and was fighting after a gap of 3 months and 13 days. Bramble was on a 17-fight win streak with a 57% KO rate, and fighting after a layoff of 7 months and 10 days.
Edwin Rosario made very easy work of Livingstone Bramble, stopping the champion via KO in the 2nd. Rosario improves his record to 29-2 (25 KOs), while Bramble adds a loss to his record at 24-2-1.
On March 17, 1984, the 21-year-old WBC lightweight world champion, Edwin Rosario (22-0, 20 KOs), faced Roberto Elizondo, in a title defense fight.
Rosario came in to the fight on a 22-fight win streak with a 90% KO rate, and was fighting after a gap of 10 months and 16 days.
Edwin Rosario made quick work of Roberto Elizondo, stopping the challenger via TKO in the 1st. Rosario improves his record to 23-0 (21 KOs)
On June 14, 1991, a 28-year-old Edwin Rosario (40-4, 35 KOs) got a shot at the WBA super-lightweight title held by Loreto Garza.
Rosario came in to the fight on a 1-fight win streak with a 79% KO rate, and was fighting after a gap of 9 months and 22 days.
Edwin Rosario made easy work of Loreto Garza, stopping the champion via TKO in the 3rd. Rosario improves his record to 41-4 (36 KOs)
On August 11, 1987, the 24-year-old WBA lightweight world champion, Edwin Rosario (30-2, 26 KOs), faced a 23-year-old fellow Puerto Rican boxer Juan Nazario (18-1, 12 KOs), in a title defense fight.
Rosario came in to the fight on a 2-fight win streak with a 81% KO rate, and was fighting after a gap of 5 months and 4 days. Nazario was on a 13-fight win streak with a 63% KO rate, and fighting after a layoff of 10 months and 16 days.
Edwin Rosario stopped Juan Nazario via TKO in the 8th round of the 15-round world-title fight, and successfully defended his WBA lightweight title. Rosario improves his record to 31-2 (27 KOs), while Nazario adds a loss to his record at 18-2.
On July 9, 1989, 26-year-old Edwin Rosario (38-3, 34 KOs) and Anthony Jones fought for the vacant WBA lightweight title.
Rosario came in to the fight on a 7-fight win streak with a 82% KO rate, and was fighting after a gap of 3 months and 23 days.
Edwin Rosario stopped Anthony Jones via TKO in the 6th round of the 12-round world-title fight. Rosario improves his record to 39-3 (35 KOs)
On May 1, 1983, 20-year-old Edwin Rosario (21-0, 20 KOs) and 24-year-old José Luis Ramírez (82-4, 69 KOs) fought for the vacant WBC lightweight title.
Rosario came in to the fight on a 21-fight win streak with a 95% KO rate, and was fighting after a gap of 11 months and 1 day. Ramirez was on a 11-fight win streak with a 80% KO rate, and fighting after a layoff of 2 months and 5 days.
Edwin Rosario defeated José Luis Ramírez via unanimous decision . Rosario improves his record to 22-0, while Ramirez adds a loss to his record at 82-5.
On June 23, 1984, the 21-year-old WBC lightweight world champion, Edwin Rosario (23-0, 21 KOs), faced Howard Davis Jr., in a title defense fight.
Rosario came in to the fight on a 23-fight win streak with a 91% KO rate, and was fighting after a gap of 3 months and 6 days.
Edwin Rosario defeated Howard Davis Jr. via split decision and successfully defended his WBC lightweight title. Rosario improves his record to 24-0
On May 30, 1982, a 19-year-old Edwin Rosario (20-0, 19 KOs) and Edwin Viruet met in the ring.
Rosario came in to the fight on a 20-fight win streak with a 95% KO rate, and was fighting after a gap of 2 months and 9 days.
Edwin Rosario stopped Edwin Viruet via TKO in the 3rd round. Rosario improves his record to 21-0 (20 KOs)
On June 13, 1986, a 23-year-old Edwin Rosario (28-1, 24 KOs) got a shot at the lightweight WBC title held by 24-year-old fellow Puerto Rican boxer Hector Camacho (28-0, 15 KOs).
Rosario came in to the fight on a 4-fight win streak with a 82% KO rate, and was fighting after a gap of 5 months and 17 days. Camacho was on a 28-fight win streak with a 53% KO rate, and fighting after a layoff of 5 months and 26 days.
Héctor Camacho defeated Edwin Rosario via split decision and successfully defended his WBC lightweight title. Camacho improves his record to 29-0, while Rosario adds a loss to his record at 28-2.
On March 21, 1982, a 19-year-old Edwin Rosario (19-0, 18 KOs) and Dennis Quimayousie met in the ring.
Rosario came in to the fight on a 19-fight win streak with a 94% KO rate, and was fighting after a gap of 1 month and 21 days.
Edwin Rosario stopped Dennis Quimayousie via TKO in the 1st round. Rosario improves his record to 20-0 (19 KOs)