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Edwin Rosario had a total of six losses in his professional boxing career — five of them in title bouts and one in a non-title bout. He suffered his first loss against José Luis Ramírez via 4th round TKO on November 3, 1984, which ended his 24-fight win streak. He was stopped five times and lost once via decision.
Frankie Randall, Akinobu Hiranaka, Juan Nazario, Julio César Chávez, and Hector Camacho are some of the boxers who have beaten Rosario.
This is the first loss in Edwin Rosario's career. Rosario lost to Mexican boxer José Luis Ramírez in a rematch via 4th round TKO on . He was defending his lightweight WBC title, he was 21 years old with a record of 24-0. Ramirez was 25 years old with a record of 87-5.
On Rosario lost to fellow Puerto Rican boxer Hector Camacho via 12 round split decision. He was fighting for Camacho's lightweight WBC title, he was 23 years old with a record of 28-1. Camacho was 24 years old with a record of 28-0.
On Rosario lost to Mexican boxer Julio César Chávez via 11th round TKO. He was defending his lightweight WBA title, he was 24 years old with a record of 31-2. Chávez was 25 years old with a record of 56-0.
On Rosario lost to fellow Puerto Rican boxer Juan Nazario in a rematch via 8th round RTD. He was defending his lightweight WBA title, he was 27 years old with a record of 39-3. Nazario was 26 years old with a record of 21-2.
On Rosario lost to Akinobu Hiranaka via 1st round TKO. He was defending his super-lightweight WBA title, he was 29 years old with a record of 41-4.
On Rosario lost to American boxer Frankie Randall in a rematch via 7th round TKO in a non-title bout. He was 29 years old with a record of 42-5. Randall was 31 years old with a record of 45-2-1.