Edwin "Chapo" Rosario Rivera (Spanish pronunciation: [ˈeðwin roˈsaɾjo]; March 15, 1963 – December 1, 1997) was a Puerto Rican professional boxer who competed from 1979 to 1997. He is a world champion in two weight classes, having held the WBC lightweight title from 1983 to 1984, the WBA lightweight title twice between 1986 and 1990, and the WBA super lightweight title from 1991 to 1992.

With a record of 47 wins, 6 losses and 41 wins via the way of knockout. He head beaten:
-Edwin Viruet (31-4-2) at Age 32. Rosario was 19 years old. Viruet was in a streak of 7 win. His most defining win was against Vilomar Fernandez, who went to beat Alexis Arguello after their bout.
-Livingstone Bramble (24-1-1) at Age 26, Bramble had beaten twice in a row the knockout artist and HOF Ray Mancini, one by late knockout (29-1) and the other by unanimous decision (29-2). He was a WBA lightweight champion, Rosario derailed Bramble's career with a 2nd round KO.
-Howard Davis Jr (26-1) at Age 28, Davis was a experienced veteran and a Olympic Gold Medalist
-Juan Nazario (18-1) was a WBA lightweight champion that beaten Sammy Fuentes and a declined Rosario in the rematch.
-Jose Luis Ramirez (82-4) at Age 24, in a competitive close bout Rosario managed to get the WBC World title at age 20. Ramirez was known to have a competitive controversial split decision loss to Alexis Arguello and went to have a controversial win in a competitive bout with Pernell Whitaker. He also managed to win in the rematch against Rosario.
-Frankie Randall (23-0) at Age 24. A three time light welterweight champion. He had beaten Sammy Fuentes, and Juan Martin Coggi. He had also beaten a declining but still game Chavez Sr and Edwin Rosario.
-Loreto Garza (28-1-1) at Age 29. He was a light welterweight champion, he has beaten Juan Martin Coggi, and Vinny Pazienza.
Rosario also had a close split decision loss to fellow Hall of Famer Hector "Macho" Camacho (28-0).
How would he fair against the current lightweight division having champions like Davis, Stevenson and Lomachenko?

With a record of 47 wins, 6 losses and 41 wins via the way of knockout. He head beaten:
-Edwin Viruet (31-4-2) at Age 32. Rosario was 19 years old. Viruet was in a streak of 7 win. His most defining win was against Vilomar Fernandez, who went to beat Alexis Arguello after their bout.
-Livingstone Bramble (24-1-1) at Age 26, Bramble had beaten twice in a row the knockout artist and HOF Ray Mancini, one by late knockout (29-1) and the other by unanimous decision (29-2). He was a WBA lightweight champion, Rosario derailed Bramble's career with a 2nd round KO.
-Howard Davis Jr (26-1) at Age 28, Davis was a experienced veteran and a Olympic Gold Medalist
-Juan Nazario (18-1) was a WBA lightweight champion that beaten Sammy Fuentes and a declined Rosario in the rematch.
-Jose Luis Ramirez (82-4) at Age 24, in a competitive close bout Rosario managed to get the WBC World title at age 20. Ramirez was known to have a competitive controversial split decision loss to Alexis Arguello and went to have a controversial win in a competitive bout with Pernell Whitaker. He also managed to win in the rematch against Rosario.
-Frankie Randall (23-0) at Age 24. A three time light welterweight champion. He had beaten Sammy Fuentes, and Juan Martin Coggi. He had also beaten a declining but still game Chavez Sr and Edwin Rosario.
-Loreto Garza (28-1-1) at Age 29. He was a light welterweight champion, he has beaten Juan Martin Coggi, and Vinny Pazienza.
Rosario also had a close split decision loss to fellow Hall of Famer Hector "Macho" Camacho (28-0).
How would he fair against the current lightweight division having champions like Davis, Stevenson and Lomachenko?
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