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Las Vegas - Floyd Mayweather outclassed Conor McGregor with a 10th-round stoppage here on Saturday to win their money-spinning superfight and clinch his 50th straight victory.
Former welterweight boxing champion Mayweather, who had emerged from a two-year retirement to take on the Irish mixed martial arts star, took his time to get going before dominating from the fourth round.
The end came with a tired McGregor doubled over on the ropes as Mayweather landed two hard left hooks, prompting referee Robert Byrd to intervene and declare a technical knockout.
"He's a lot better than I thought he'd be," Mayweather said. "He's a tough competitor, but I was the better man tonight."
Mayweather said he had deliberately taken his time early on in order to take advantage of a fatigued McGregor.
"Our game plan was to take our time, go to him, let him shoot his shots early and then take him out down the stretch," he said. "I guaranteed to everybody that this wouldn't go the distance."
McGregor meanwhile suggested the fight could have been allowed to go on, but praised Mayweather's clinical tactical display.
"He's composed, he's not that fast, he's not that powerful, but boy is he composed in there," McGregor said.
"I thought it was a bit of an early stoppage. I was just a little fatigued. He was just a lot more composed with his shots.
"I have to give it to him, that's what 50 pro fights will do for you."
It was an explosive finale to their much-hyped contest which proved surprisingly competitive in the early rounds as McGregor managed to land a string of scoring punches.
But once Mayweather began to find his range and McGregor wearied rapidly, there was only going to be one winner.
The 40-year-old American scored at will after the fourth round, snapping back McGregor's head with a series of stinging blows.
McGregor, 29, somehow survived an onslaught in the seventh round when a right counter from Mayweather staggered him badly.
Finally McGregor's resistance broke in the 10th when a Mayweather right sent him lurching across the ring.
A hard left put him on the ropes and another hook saw him bent over and helpless, prompting the stoppage.
The fight had followed a largely expected script but McGregor, in his first ever boxing appearance, by no means embarrassed himself.
Mayweather will now head into what he says is a permanent retirement with a perfect 50-0 record, one better than heavyweight legend Rocky Marciano.
"A win is a win, no matter how you get it," Mayweather said. "Rocky Marciano is a legend and I look forward to going into the Hall of Fame one day.
"This was my last fight tonight. For sure. Tonight I chose the right dance partner to dance with."
Mayweather is also expected to be around $200 million wealthier, taking his career earnings to around $1 billion.
McGregor, who was an unemployed former plumber four years ago before emerging as one of the biggest stars of the Ultimate Fighting Championship, is expected to earn around $100 million.
The start of the fight had been delayed as anticipation built to fever pitch and television providers struggled to cope with the surge in demand from pay-per-view customers.
Anticipation had built steadily at ringside as an array of stars from the sports and entertainment worlds took their seats, including Bruce Willis, LeBron James and Mike Tyson.
