On April 4, 1990, Juan Nazario and Edwin Rosario met again in a rematch.
Nazario came in to the fight on a 3-fight win streak with a 65% KO rate, and was fighting after a gap of 5 months and 14 days. Rosario was on a 8-fight win streak with a 83% KO rate, and fighting after a layoff of 8 months and 26 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 August 18, 1983, a 19-year-old Juan Nazario (8-1, 4 KOs) and Sammy Fuentes met in the ring.
Nazario came in to the fight on a 3-fight win streak with a 44% KO rate, and was fighting after a gap of 3 months and 17 days.
Juan Nazario stopped Sammy Fuentes via KO in the 5th round. Nazario improves his record to 9-1 (5 KOs)
On September 4, 1992, a 28-year-old Juan Nazario (23-3, 16 KOs) and Kent Hardee met in the ring.
Nazario came in to the fight on a 1-fight win streak with a 61% KO rate, and was fighting after a gap of 2 months and 22 days.
Juan Nazario stopped Kent Hardee via KO in the 1st round. Nazario improves his record to 24-3 (17 KOs)
On March 17, 1984, a 20-year-old Juan Nazario (11-1, 7 KOs) and Jose Vidal Concepcion met in the ring in a super-featherweight bout.
Nazario came in to the fight on a 6-fight win streak with a 58% KO rate, and was fighting after a gap of 1 month and 14 days.
Juan Nazario stopped Jose Vidal Concepcion via TKO in the 9th round. Nazario improves his record to 12-1 (8 KOs)
On September 13, 1982, an 18-year-old Juan Nazario (4-0, 1 KO) and Tom Tripp met in the ring.
Nazario came in to the fight on a 4-fight win streak with a 25% KO rate, and was fighting after a gap of 23 days.
Juan Nazario stopped Tom Tripp via KO in the 2nd round. Nazario improves his record to 5-0 (2 KOs)
On October 21, 1989, a 26-year-old Juan Nazario (20-2, 14 KOs) and Higinio DeLeon met in the ring.
Nazario came in to the fight on a 2-fight win streak with a 63% KO rate, and was fighting after a gap of 9 months and 1 day.
Juan Nazario stopped Higinio DeLeon via TKO in the 3rd round. Nazario improves his record to 21-2 (15 KOs)
On August 23, 1986, a 22-year-old Juan Nazario (16-1, 10 KOs) and Sam Johnson met in the ring for the 2nd time,.
Nazario came in to the fight on a 11-fight win streak with a 58% KO rate, and was fighting after a gap of 1 year, 1 month, and 26 days.
In the rematch, Juan Nazario stopped Sam Johnson via TKO in the 3rd round. Nazario improves his record to 17-1 (11 KOs)
On March 23, 1983, a 19-year-old Juan Nazario (6-1, 3 KOs) and Sam Johnson met in the ring.
Nazario came in to the fight on a 1-fight win streak with a 42% KO rate, and was fighting after a gap of 19 days.
Juan Nazario stopped Sam Johnson via TKO in the 3rd round. Nazario improves his record to 7-1 (4 KOs)
On August 21, 1982, an 18-year-old Juan Nazario (3-0, 0 KOs) and Rafael Pichardo met in the ring.
Nazario came in to the fight on a 3-fight win streak with a 0% KO rate, and was fighting after a gap of 28 days.
Juan Nazario stopped Rafael Pichardo via KO in the 3rd round. Nazario improves his record to 4-0 (1 KO)
On September 26, 1986, a 22-year-old Juan Nazario (17-1, 11 KOs) and Jose Mosqueda met in the ring.
Nazario came in to the fight on a 12-fight win streak with a 61% KO rate, and was fighting after a gap of 1 month and 3 days.
Juan Nazario stopped Jose Mosqueda via TKO in the 4th round. Nazario improves his record to 18-1 (12 KOs)