McGregor couldn't cause an upset and beat the future hall of famer at his own game.
Even if you weren't a massive fan of UFC (MMA) or boxing before, you'll still have been keeping an eye on this fight. Albeit you might not have stayed up to watch it live (if you're in the UK).
For this reason, we've decided to give you a quick overview of the fight, in case you couldn't be bothered to watch it, but still want to know the result.
Alright, so let's get to the facts, and what you probably came here to find out. Floyd Mayweather won the fight via TKO (technical knock out) in the 10th round, which is a very respectable effort from Conor McGregor, considering he's not even a professional boxer.
And let's be brutally honest here, if Mayweather stepped into the octagon with McGregor, then the fight wouldn't last more than 1 round. But saying that, at the age of 40, Mayweather managing to outclass a 29-year-old UFC champion in his peak, is definitely still an achievement - especially as he put his career record on the line.
During the early rounds, Floyd put his hands up and stayed on the defensive, allowing Conor to attack him. However, the more the fight went on, the clearer it became that this was his game-plan - and it worked.
After the 4th round, Mayweather came to life and took the offensive. Although neither fighters were ever going to fall face first onto the mat (Rocky Balboa style), it was still a convincing victory for the 40-year-old boxing legend.
We've posted a video of the full fight below (but don't blame us if it gets taken down).
After Fight Comments
As always, McGregor was respectful after the fight, despite his trademark trash-talking during the pre-fight press conferences. As was Mayweather, as he handed his opponent some praise.
Even if you weren't really bothered about this fight, it's all you'll be seeing on TV or the newspapers today. Was it worth it? Maybe.
It wasn't exactly the blood-bath that UFC fans are used to seeing in the octogon, and avid boxing fans would have been slightly shocked by McGregor's unorthodox boxing style (and the rabbit punches and other shots he probably could have been sanctioned for).
However, although Ricky Hatton's fight with Mayweather was in 2007 (when Floyd was in his early 30's), Conor McGregor still managed to last the same amount of time as him. Why are we comparing McGregor to Hatton? Well, Hatton was a highly respected boxer at the time he lost, even delivering Castillo his first TKO.
So taking this into consideration, McGregor lasting the same amount of time in the ring as Ricky Hatton is actually pretty impressive.
But what do we know? We're experts in fitness and nutrition - and we even know a fair amount about mixed martial arts. But to be honest, we don't know sh*t about boxing (we only wrote this as one of our fans wanted our input).