On the evening of March 10, 1986, an aptly named John “The Beast” Mugabi was about to learn two difficult lessons. The first was that Las Vegas is almost exclusively a place of broken dreams. The second was that the equally aptly named Marvelous Marvin Hagler was painfully good at delivering the first lesson.

Hagler had not lost a fight in 10 years and had successfully defended the middleweight championship 11 consecutive times. That meant nothing to Mugabi, however, because he had come to Vegas as most young men do, with a head filled with the kind of confidence that comes with being undefeated in life. Before midnight on that chilly evening, he would have a new perspective on life and a swollen face.

Read more about Hagler's brawl with Mugabi in The Ring's May 1986 issue 🥊💥

Mugabi had been born in Kampala, the capital city of Uganda. It is a city of mostly hard parts, but Mugabi was spawned from the hardest, dropping out of school at the age of 7 after his father died in an auto accident. Nobody came looking for him.

By the age of 9, he was a gang member, a thief and a street fighter. He wasn’t called “The Beast” for nothing.

“When I was a baby, I had to steal my dinners,” Mugabi recalled. “Now I walk in through the front door. Anybody who tried to abuse me, I kicked his ass.

“I was good, but I fought [on the street] so people would say, ‘This kid can beat even five people.’ It is why I can fight anybody. I have fought since I was 9. Nobody do nothing for John Mugabi. It is God who taught me to fight.”

Now 26 years old, Mugabi was the owner of an unblemished record of 25-0. Every opponent he’d faced had failed to go the distance with him.

Unfortunately for Mugabi, he was not the only man God had taught to fight. Hagler had come up from similarly hard circumstances in Newark, New Jersey. He had become a relentless warrior, too, a fighter who understood challenges and young men like Mugabi, men filled with hope and belief and bad intentions. He understood who “The Beast” was, but he also understood himself. It’s why he had gone to court to make “Marvelous” his legal name.

The 31-year-old Hagler was 61-2-2 with 51 knockouts by this stage of his career and was coming off a brutal third-round knockout of one of boxing’s true superstars, Thomas Hearns, 11 months earlier. It was not only the Fight of the Year. For many, it was, and remains, the greatest middleweight fight in boxing history. It was certainly the most spectacular, a three-round dogfight in which Hagler survived murderous blows without taking a backward step from one of boxing’s hardest punchers before ending Hearns’ Las Vegas dream with a barrage of punches that left his legs rubbery and his mind blinking like a tilted pinball machine. Hearns had lasted less than nine minutes in the presence of Marvelous Marvin Hagler before it was game over.

Hearns was in Las Vegas as well to fight a man named James Shuler. If he and Hagler both won, they were set to face each other again later in the year. But such had become the celebrity and mystique of Marvin Hagler that the size of Hearns’ purse for a rematch was to be based on what he did with Shuler. Hearns had a unique series of clauses in his contract with Hagler’s promoter, Top Rank’s Bob Arum. If he knocked Shuler out within six rounds, he would be guaranteed $3.5 million for the rematch. If he knocked him out within 12 rounds, he would be guaranteed $3.25 million. If he won by decision, his purse for facing Hagler would shrink to only $3 million.

“Hagler’s the only man I really still want to fight,” Hearns insisted that week. “It’s a fact that we don’t communicate. He hates my guts and I hate his. It’s not like it was with Ray Leonard. Leonard and I went out a few times. We had some good times. The only place I would take Hagler is to a mud-wrestling match so I could throw some mud on him.

“I respect him as a fighter, but as a person, I don’t think much of him. I hate the ground he walks on.”

What Hearns actually hated was the ground Hagler sat him on with a barrage of punches that left him semiconscious. Neither Hagler nor Mugabi were concerned with Hearns, however. Hagler figured he’d blow up that bridge when he came to it, while Mugabi believed after he was done with Hagler, he would be the one who decides which opponent he would face next.

“I realize Mugabi has the same dream I had,” Hagler said before the fight. “He wants to be the champion. But it took me a long time to put food on the table and to wear nice clothes. Nobody is taking that away from me.

“I know my position. Guys like Mugabi keep coming up, keep coming after me, keep coming to take what I got. I help them gain financial security. This is what I do. I make ’em and then I break ’em.”

The road to this match had long been a broken trail itself, as long and arduous a trek as the fight would become that night. It was originally scheduled for November 14, 1985, but Hagler, who was suffering from a sore back at the time, had his nose broken in training when a young sparring partner named Zach Hewitt accidentally butted him. It was only the first in a string of difficulties.

Shuler and Mugabi at the time had been Hagler’s and Hearns’ respective mandatory challengers for the titles they held (Hearns was still junior middleweight champion despite his loss to Hagler), but Mugabi had moved to middleweight in hopes of facing Hagler while Shuler agreed to take $250,000 in step-aside money from Hagler and landed the fight against Hearns instead. The first snag developed when the WBA then promoted its No. 2 contender, James Kinchen, to No. 1 and threatened Hagler that it would strip him of its version of the title if he refused to face the new mandatory challenger.

Hagler was unwilling to give up the WBA title, as that would mean he was no longer undisputed champion, and such was his celebrity after the dramatic win over Hearns that he now had the power to influence the sanctioning body’s thinking. Prior to stopping Hearns, Hagler was a well-respected boxer within his profession, but outside of it he was veritably unknown. After his brutal victory, Hagler had become so popular to the general public that he began doing nationally televised ads for men’s deodorant, pizza and other items, only adding to his sudden star status. By the time the WBA threatened him, he had more sway in the marketplace of public opinion than it did, and both sides knew it.

Arum began negotiating a settlement with WBA president Gilberto Mendoza, ultimately convincing him to install Mugabi as its No. 1 middleweight contender. Kinchen quickly sued Hagler, Arum and the WBA, saying, “I’d rather fight Hagler in the ring than in court.”

The WBA immediately reversed course. But in boxing, as in many ways of life, money talks and all else walks. In this case, Kinchen walked into a two-fight promotional deal with Arum to face top contenders Iran Barkley and Juan Roldan, which proved to be a good deal for Mugabi, who got his shot at Hagler. It was also good for Hagler, who got his shot at earning a guaranteed $2.5 million plus an upside from the closed-circuit and pay-per-view sales on Showtime. In the case of Kinchen, the deal did not work out so well. He lost both fights and never got a 160-pound title shot.

Mugabi, meanwhile, entered the ring as the No. 1-ranked middleweight in the world, and Hagler remained the undisputed champion of the IBF, WBA and WBC as well as the Ring Magazine champion. That’s boxing.

Hagler was a heavy 3-to-1 betting favorite when the two men walked into the chilly outdoor arena constructed behind Caesars Palace, with few believing Mugabi was ready to meet this challenge. Mugabi was not one of them.

“He is old,” he said with a look of utter disrespect several days before the fight. “Boxing is [about] exchanging hands. He got two hands. I got two hands. What is he going to do to me with his hands?

“I’ll hit him in the belly because his kidneys are old. His brain is full of punches. When he feels my power, his brains will bust out. I don’t run. I’m just there to fight.

“The rule is elimination. That is what the ring is all about. I want Marvin Hagler’s championship belt. He doesn’t want to give it to me. I am going to have to take it from him. We destroy each other, and then there is a winner.”

To be fair, Mugabi’s legendary manager, Mickey Duff, was not quite so fervent in believing his fighter would be that winner. Duff knew Hagler was in for a more difficult night than he might be expecting, but he remained a realist.

“[Mugabi is] the best pound-for-pound puncher I’ve been involved with,” claimed Duff, who had by then been in boxing’s dark trade for 36 years and counting. “He may be the best puncher I’ve ever seen.

“For John to be effective, he has to hit Hagler. Everyone has hit Hagler. John hasn’t fought too many Marvin Haglers, but my guy knows he only has to hit Hagler with a combination of three or four punches. If he does, there’s no way he ain’t gonna rock Hagler.

“I would have to be naive to say John is a cinch Monday night, but I have no doubt he is the toughest opponent Marvin Hagler has fought to date. He’s the first opponent who will not be one percent intimidated by Hagler.”

Duff would prove to be prescient on all points. Mugabi was not the least bit intimidated by Hagler’s presence across the ring. In fact, attacking with his characteristically wild hooks, Mugabi won the first round in part because Hagler unwisely chose to fight him from an orthodox stance rather than his usual southpaw style.

Hagler quickly switched back to a left-handed stance in Round 2 and began the process of breaking Mugabi down by slamming a hard right jab into his face like a jackhammer. By fight’s end, he would do it 186 times, controlling the terms of engagement with it initially and gradually using it to get inside Mugabi’s powerful hooks to deliver the kind of telling blows that eventually can convince you this is not your night.

Mugabi was a hard man to convince, however. He did his own damage, especially in the first half of the fight, although he was rocked and hurt in Round 6 in a preview of things to come. The only thing that appeared to save Mugabi was the odd intervention of referee Mills Lane. That round, Hagler launched 95 punches in Mugabi’s direction and landed 59, a connect rate of 62%.

That would be a winning total against most men, but The Beast was not most men. Still, he was clearly hurt when Lane jumped in to warn Hagler about low blows in the middle of a four-punch combination that had Mugabi reeling. The worst consequence for Hagler was that Lane’s intervention allowed the retreating Mugabi time to recover.

The next round, he would deduct a point from Hagler for a similar infraction. Mugabi won Round 9 on all three judges’ cards and Round 10 on two of three. Far more significantly, by then he had all but closed Hagler’s right eye and had blood flowing from Hagler’s nose. The champion led on all three cards when the bell rang for the 11th round, but he had paid a high price, as promised by Mugabi and Duff, to get inside Mugabi’s wildly unorthodox wide hooks and tear at him from close quarters.

Having never ventured into the places Hagler was now taking him, Mugabi had begun to tire. His will remained, but his skills had begun to diminish from the lashing Hagler was putting on him.

Between Rounds 10 and 11, Mugabi leaned back against the ring post in his corner like a tired factory worker after a double shift. His chest heaved and his lips hung open to allow in more oxygen, as Duff, Mugabi’s trainer George Francis and the priest who had baptized him into the Catholic Church a few weeks earlier all exhorted him to fight on.

“Do it for the children, John!” Duff hollered at him. “Do it for the children!” But the challenger was beginning to feel the collective weight of all the punches he’d endured to get to this point. As Mugabi slowed down, Hagler moved ever closer, like a rattlesnake ready to strike, though he was paying a high price for this, higher even than Hearns had extracted, and his swollen face showed the cost. Yet nothing could convince him to back up. Nothing could stop his relentless defense of a title he believed was his and his alone. Not even a Beast could do that, and so, after having lost the previous two rounds on the scorecards of two of the three judges, Hagler lashed out one final time.

He struck Mugabi with two powerful rights two minutes into Round 11 that seemed to daze him. Then landed two more, the first knocking Mugabi back, and the second sending him slumping to the floor. Mugabi had weathered 398 punches from Marvelous Marvin Hagler, according to CompuBox, as the cost of attempting to win a championship. Instead, he’d become Hagler’s 12th consecutive victim since first winning the middleweight title six years earlier.

After those final two crushing rights, Mugabi, exhausted, struggled to prop himself up in a sitting position, one hand resting on the ropes as Lane counted him out at 1:29 of the round. Only Mugabi’s body had risen that far. His mind was still down.

“I never saw either right,” Mugabi admitted later. “He was swinging around [from right-handed to left-handed]. He came round a different way. I tried my best to take Marvin Hagler. He is a great champion.”

Almost in disbelief, Mugabi’s loyal trainer skittered along the ring apron with a wet sponge in his hand. What he really needed was a life preserver, but it was too late to employ either to any good end.

It had been an unexpectedly hellish night at work for Hagler, but when all was said and done, he had left another man beaten into submission. As Lane moved in to finish his count, Mugabi stared into space, simply too exhausted to do anything else.

His title quest ended, John “The Beast” Mugabi would be leaving Las Vegas like most of its visitors: He’d lost his bet and had taken a beating. Hagler, meanwhile, smiled through bloody lips with his right eye nearly shut as tightly as a venetian blind. He would talk of retirement, not of Thomas Hearns that night.

And he would speak about Mugabi far differently than he had the day before.

“My whole body is swollen,” Hagler joked. “I got caught with a lot of shots, but I had to take them to get to him. He had a great strategy. It’s very tough to knock the guy out when he fights with the strategy this guy used.

“I went after him early, but I had to retreat a little bit and wear him down. He was counterpunching, so I had to change my style. I had to be patient.”

Marvin Hagler had taken a beating like never before, but he had also proven something once again. He’d proven he was indeed still Marvelous … and still the undisputed middleweight champion of the world.