Hector Camacho vs. Edwin Rosario

The Héctor Camacho versus Edwin Rosario fight took place on June 13, 1986, at the Madison Square Garden in New York City.
Background.
Televised in the United States by HBO Boxing and in Puerto Rico by WAPA-TV (and to several other countries), the fight garnered wide media attention, especially in Puerto Rico: It was the fourth time that two Puerto Ricans battled for a world boxing title, and, at that time, it was also the world title fight that pitted the two boxers who hailed from the closest birth-places in boxing history (Camacho was born in Bayamón, while Rosario was from Toa Alta, a mere fifteen-minute car drive away from Bayamón). Sports reporter Rafael Bracero travelled to New York to make a documentary about the fighters and the fight, and even former BSN basketball star Fufi Santori, a self-declared not fan of boxing, got caught in the fight's hype, making a prediction on television on the day of the fight. He predicted Camacho would win.
The fight was for the WBC World Lightweight Title, earned by Camacho after his win over José Luis Ramírez, who had, in turn, beaten Rosario for the title.
Undercard.
The undercard included a young Mike Tyson knocking out Reggie Gross in the first round and Julio César Chávez (who would later beat Camacho, Ramirez and Rosario) defending his WBC world Jr. Lightweight title with a seventh-round knockout of Refugio Rojas. Camacho was criticized by many Puerto Ricans because of the trunks he wore that day; he wore a Puerto Rican flag, but with the flag's white star to his back. This was seen by many as an unpatriotic act, although Camacho had always proclaimed to be proud of being a Puerto Rican, and continued to proclaim so until he died in 2012.
Fight.
The first three rounds were swept by Camacho on all three judges' scorecards by keeping Rosario away with his jab and outcircling the pursuing challenger. In the fourth, Rosario began to turn things around by landing an uppercut in the final seconds, which earned him the round.
In round five, Rosario connected with a left to the chin as Camacho was getting ready to fire a right hand, and Camacho's knees buckled. On the verge of falling, Camacho took his distance for the rest of the round, and Rosario continued on pursue, landing other damaging blows. 
Rounds six to ten were dominated by Camacho (out of a possible fifteen combined rounds, as three judges were scoring the fight, Rosario was given only one round between rounds six and ten by one judge).
In round eleven, Rosario hurt Camacho again, with a sneaky left hook through Camacho's guard. Feeling he had a lead on the scorecards, Camacho again circled around the ring and grabbed, to avoid Rosario's punches. Rosario continued landing in round twelve, also sweeping the round on all judges' cards.
Minutes later, Camacho was announced as winner and still WBC world Lightweight champion by a split decision (scores of 118–111 and 115–114 for Camacho, and 114–113 for Rosario). The fight's result proved controversial, Puerto Ricans and other boxing fans who saw the fight have argued about the scoring ever since.
Aftermath.
Days later, El Vocero newspaper reported of a murder related to the fight: apparently, a man had made a bet with another man, and after Rosario lost, the murder victim told his killer that he really didn't have any money, causing the killer to get enraged and shoot him.
A rematch had been planned in 1997, but it never occurred.