Floyd Mayweather extended his perfect career record to 50 fights unbeaten by stopping Conor McGregor in the 10th round of one of the richest bouts in boxing history.
The former five-weight world champion faced flurries of early punches from UFC's most iconic figure, who was making his debut in professional boxing at Las Vegas' T-Mobile Arena.
Conor McGregor claimed he has never seen Floyd Mayweather in worse physical shape as the pair exchanged words at a raucous weigh-in in Las Vegas.
McGregor weighed in at 153lbs for Saturday's 154lb fight, with Mayweather 149.5lbs, before a face-off that drew roars from the thousands in attendance.
Conor McGregor's fight on Saturday against Floyd Mayweather is his first ever professional boxing contest
The opening event of a week of build-up to potentially the most lucrative fight in boxing history produced chaotic scenes in Las Vegas, with Floyd Mayweather booed by unhappy fans.
The undefeated American arrived and was barely visible, entering amid a large entourage before being largely hidden on stage by a media scrum.
Edvald Boasson Hagen won stage 19 of the Tour de France as Britain's Chris Froome maintained his overall lead.
The Norwegian was part of a 20-man breakaway but made a winning solo attack late on to finish ahead of Germany's Nikias Arndt in second and Jens Keukeleire of Belgium in third.
Floyd Mayweather and Conor McGregor are staging four media events to promote their fight on 26 August
Conor McGregor promised to knock out Floyd Mayweather inside four rounds when they faced off for the first time to promote their 26 August bout.
The pair appeared in front of thousands of fans at a news conference in Los Angeles - the first of four events called to promote the Las Vegas fight.
