SAN JUAN, Puerto Rico, November 3, 1984 — In a night packed with drama, heart, and pure grit, Mexico’s Jose Luis Ramirez shocked the hometown crowd at Estadio Hiram Bithorn by stopping Puerto Rico’s Edwin “Chapo” Rosario in the fourth round of a wild, back-and-forth brawl to capture the WBC Lightweight Championship.

The rematch, fought under a steamy Caribbean sky, delivered non-stop action from the opening bell. Rosario, defending his title before a partisan crowd, wasted no time asserting his power. A perfectly timed right hand dropped Ramirez in the opening seconds of round one, setting the tone for what many thought would be a short night.

Ramirez, however, refused to fold. Rising with fire in his eyes, he returned fire and turned the early rounds into a punishing exchange of bombs. In round two, Rosario sent Ramirez down again, this time with a thunderous right that seemed destined to close the show. But the Mexican warrior dug deep, survived the round, and began clawing his way back.

By round three, the tide was shifting. Ramirez’s relentless pressure began wearing down Rosario, who started showing signs of fatigue. While both men traded heavy leather, it was Ramirez who had the last word in the round, rocking Rosario with a combination that silenced the crowd and rattled the champion’s confidence.

Round four was the breaking point. After a slow start to the frame, the action exploded once again. Ramirez unleashed a furious barrage — right hooks, uppercuts, body shots — pinning Rosario against the ropes and then into a corner. With Rosario defenceless, Ramirez unloaded 17 unanswered punches, forcing referee Steve Crosson to step in at 2:52 and wave off the contest.

All three judges had Rosario ahead 29-28 going into the fourth, but scorecards became irrelevant as Ramirez’s stoppage crowned him the new WBC Lightweight Champion. The victory was made sweeter by the adversity Ramirez overcame — two knockdowns, hostile territory, and a fierce champion in Rosario.

The bout earned Ring Magazine’s Fight of the Year honours for 1984 and remains one of the most ferocious and emotional lightweight title fights in boxing history.