Regards to McGregor he would get absolutely blitzed by mayweather in a boxing ring, BUT, it would take quite some time for him to get McGregor out of there, as he has very weak to average punching power, but ridiculous accuracy and timing, if you think Conor is good, Mayweather is on another level for that shit. BUT, my question would be, has Mayweather ever faced another boxer with the timing and precision of McGregor? I can't think of one. Pacquiao and Canelo certainly didn't, they're not that sort of fighter. So you have to ask yourself, whilst Conor is getting blitzed by hundreds of medium strength shots, he is going to land on Mayweather, it's a fact that he just will, at somepoint. Can Mayweather take that shot? I've no idea. He gets hit significantly so very very rarely by anyone, that it's hard to tell how he'd respond. So McGregor would get tagged A LOT, but Mayweather would definitely feel a couple from Conor in that process. Do they do any damage? Could he knock him out?
I'd say a fairly early stoppage in rounds 3-5 from the ref if I was putting money on it. But, if Conor caught him, fucks knows what would happen, we've never really seen any history to that before.
In a MMA fight, fuck me, brutal. Probably over 30-60 seconds in via a rape.