On January 30, 1993, a 29-year-old Edwin Rosario (42-5, 37 KOs) and a 31-year-old American boxer Frankie Randall (45-2-1, 36 KOs) met in the ring for the 2nd time,.
Rosario came in to the fight on a 1-fight win streak with a 78% KO rate, and was fighting after a gap of 5 months and 19 days. Randall was on a 14-fight win streak with a 75% KO rate, and fighting after a layoff of 4 months and 18 days.
In the rematch, Frankie Randall stopped Edwin Rosario via TKO in the 7th round. Randall improves his record to 46-2-1 (37 KOs), while Rosario adds a loss to his record at 42-6.
On April 10, 1992, the 29-year-old WBA super-lightweight world champion, Edwin Rosario (41-4, 36 KOs), faced Akinobu Hiranaka, in a title defense fight.
Rosario came in to the fight on a 2-fight win streak with a 80% KO rate, and was fighting after a gap of 9 months and 27 days.
Edwin Rosario was defending his super-lightweight WBA titles against Akinobu Hiranaka and lost via TKO in the 1st round, and adds an loss to his record at 41-5.
On April 4, 1990, Edwin Rosario and Juan Nazario met again in a rematch.
Rosario came in to the fight on a 8-fight win streak with a 83% KO rate, and was fighting after a gap of 8 months and 26 days. Nazario was on a 3-fight win streak with a 65% KO rate, and fighting after a layoff of 5 months and 14 days.
In the rematch, the champion refused to continue the fight in the 8th round, and Juan Nazario is crowned the new WBA lightweight world champion — in his first world-title fight. Nazario improves his record to 22-2 (16 KOs), while Rosario adds a loss to his record at 39-4.
On November 21, 1987, the 24-year-old WBA lightweight world champion, Edwin Rosario (31-2, 27 KOs), faced a 25-year-old Mexican boxer Julio César Chávez (56-0, 45 KOs), in a title defense fight.
Rosario came in to the fight on a 3-fight win streak with a 81% KO rate, and was fighting after a gap of 3 months and 10 days. Chávez was on a 56-fight win streak with a 80% KO rate, and fighting after a layoff of 3 months.
Julio César Chávez stopped the champion via TKO in the 11th round of the 12-round world-title fight, and is crowned the new WBA lightweight champion. Chávez improves his record to 57-0 (46 KOs), while Rosario adds a loss to his record at 31-3.
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 November 3, 1984, Edwin Rosario and José Luis Ramírez met again in a rematch.
Rosario came in to the fight on a 24-fight win streak with a 87% KO rate, and was fighting after a gap of 4 months and 11 days. Ramirez was on a 5-fight win streak with a 79% KO rate, and fighting after a layoff of 5 months and 1 day.
In the rematch, Jose Luis Ramirez stopped the champion via TKO in the 4th round of the 12-round world-title fight, winning the first world title of his career, and is crowned the new WBC lightweight champion. Ramirez improves his record to 88-5 (74 KOs), while Rosario adds a loss to his record at 24-1.