On December 9, 1992, a 29-year-old Juan Nazario (24-3, 17 KOs) and Silverio Flores met in the ring in a lightweight bout.
Nazario came in to the fight on a 2-fight win streak with a 63% KO rate, and was fighting after a gap of 3 months and 5 days.
Juan Nazario lost to Silverio Flores via KO in the 2nd round, and adds a loss to his record at 24-4.
On August 11, 1990, the 26-year-old WBA lightweight champion, Juan Nazario (22-2, 16 KOs), and the 26-year-old WBC and IBF lightweight champion Pernell Whitaker (22-1, 12 KOs) faced each other for the undisputed world championpionship.
Nazario came in to the fight on a 4-fight win streak with a 66% KO rate, and was fighting after a gap of 4 months and 7 days. Whitaker was on a 7-fight win streak with a 52% KO rate, and fighting after a layoff of 2 months and 23 days.
Pernell Whitaker made quick work of Juan Nazario, stopping Nazario via KO in the 1st. Whitaker improves his record to 23-1 (13 KOs), while Nazario adds a loss to his record at 22-3.
On August 11, 1987, a 23-year-old Juan Nazario (18-1, 12 KOs) got a shot at the lightweight WBA title held by 24-year-old fellow Puerto Rican boxer Edwin Rosario (30-2, 26 KOs).
Nazario came in to the fight on a 13-fight win streak with a 63% KO rate, and was fighting after a gap of 10 months and 16 days. Rosario was on a 2-fight win streak with a 81% KO rate, and fighting after a layoff of 5 months and 4 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 October 2, 1982, a 19-year-old Juan Nazario (5-0, 2 KOs) and Adriano Arreola met in the ring.
Nazario came in to the fight on a 5-fight win streak with a 40% KO rate, and was fighting after a gap of 19 days.
Juan Nazario lost to Adriano Arreola via points decision in the 6-round fight, and adds a loss to his record at 5-1.