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Juan Nazario had a total of four losses in his professional boxing career — two of them in title bouts and two in non-title bouts. He suffered his first loss against Adriano Arreola via 6 round PTS on October 2, 1982. He has been stopped three times and lost once via decision.
Silverio Flores, Pernell Whitaker, Edwin Rosario, and Adriano Arreola are the four boxers who have beaten Nazario.
This is the first loss in Juan Nazario's career. Nazario lost to Adriano Arreola via 6 round PTS on in a non-title bout. He was 19 years old with a record of 5-0.
On Nazario lost to fellow Puerto Rican boxer Edwin Rosario via 8th round TKO. He was fighting for Rosario's lightweight WBA title, he was 23 years old with a record of 18-1. Rosario was 24 years old with a record of 30-2.
On Nazario lost to American boxer Pernell Whitaker via 1st round KO. He was defending his lightweight WBA title, and fighting for Whitaker's lightweight WBC and IBF titles, he was 26 years old with a record of 22-2. Whitaker was also 26 years old, with a record of 22-1.
On Nazario lost to Silverio Flores via 2nd round KO in a non-title bout. He was 29 years old with a record of 24-3.