Floyd Mayweather Jr has beaten Conor McGregor after their so-called "superfight" in Las Vegas.
The former five-weight world champion stopped the Irishman in the 10th round, bringing his career record to 50 fights unbeaten.
The unconventional bout, which saw the American take on the mixed martial arts champion in the ring, was of one of the richest fights in boxing history.
Mayweather came out of retirement for the "money fight" which is believed to have netted him over £200m.
It was McGregor's professional boxing debut and he had hoped to cause a major upset in the match-up which had divided opinion among boxing purists.
McGregor's greatest chance of success came in using his superior size and weight - he was 3.5lbs heavier at Friday's weigh-in and bigger still in the ring - to smother Mayweather, set a high pace and deny him the time and space with which he excels.
A potential awkwardness at not having boxed professionally could also have threatened the American's ability to read and time him as quickly as he had so many others, but that never proved the case and by the fourth he was taking control.
Beyond a reasonable left uppercut in the opening round as Mayweather chose to analyse his unusual opponent - who repeatedly switched his stance - the punches he threw proved how unsuited he is to boxing at this level and how the two should never have shared a ring.
A recurring theme throughout the fight began in the second, when referee Robert Byrd had to warn McGregor for punching behind the head. Mayweather's defence nullified any potential sting in the Irishman's punches and then responded with two sharp right hands of his own.
McGregor's renewed aggression at the start of the fourth was swiftly turned against him as Mayweather began to read him, landing another big right on the counter after ensuring another remained out of range.
Thereafter, uncharacteristically he turned aggressor, attempting to walk his opponent down in a way he last regularly did while fighting at a far lighter weight.
In a farcical sixth-round moment Mayweather was turned and McGregor again went without punishment for punching behind the head, but by its conclusion he was showing significant signs of fatigue and unravelling amid numerous further right hands.
Any respect the American may have had for his opponent's threat disappeared at the same rate McGregor tired, his sense of distance ensuring the biggest question became how long the 29-year-old would survive.
A low blow in the ninth on Mayweather also went unpunished, but he then similarly took advantage of McGregor's lack of form to continue landing with the jab and right to leave him desperately clinging on.
The inevitable conclusion followed in the 10th when, with the stumbling McGregor unable to avoid Mayweather's sharp accurate right hands, Byrd finally showed some conviction to rescue the resilient Irishman and wave the action over after one minute and five seconds.
With victory, Mayweather's record surpassed that of the great Rocky Marciano by improving to 50-0.
He has earned so much money that, particularly with the minimum £78million he is reportedly guaranteed from defeating McGregor, he should never need to fight again.
McGregor's minimum reported purse of £23million also represents his biggest day, but even despite this one-sided defeat his popularity within UFC means he can swiftly fight within it again.
There was also earlier a victory for the fighter considered Mayweather's protege, Gervonta Davis, who controversially stopped Francisco Fonseca in eight rounds.
The week had already been a poor one for the 22-year-old American, who on Friday was stripped of his IBF super-featherweight title after failing to make weight.
Towards the end of an unconvincing performance in which his attempts at showboating far from worked, he sent Costa Rica's Fonseca to the canvas when punching him behind the head in the eighth.
He then appeared to land again while he was down, after which Fonseca did not return to his feet and was counted out after 39 seconds.
Davis, a fighter for Mayweather Promotions, was fortunate not to have been disqualified, but will likely imminently fight again to recover the vacant title.
Meanwhile, McGregor accused the referee of calling time on the fight too early.
"I thought it was close, I thought the stoppage was a bit early, there wasa lot on the line and I thought he should have let me carry on.
"I was just a little fatigued. He is composed and you have got to give it to him."
Britain's former heavyweight world champion Lennox Lewis tweeted that McGregor has "nothing to be ashamed of".
Manny Pacquiao, who lost to Mayweather in 2015, also tweeted his "respect":