Like his idol Muhammad Ali, McGregor liked predicting when he would finish off an opponent. But unlike Ali, McGregor was willing to go all in on his claims and put some money on the line.
Well, actually, it wasn’t just some money. McGregor reportedly bet UFC President Dana White $3 million that he would knock out Chad Mendes in the second round at UFC 189.
"You want to know how confident this kid is? I can't even believe I'm going to say this, but he told Lorenzo [Fertitta, UFC co-owner] and I the other day, 'I'll bet you $3 million I knock him out in the second round.' "
McGregor wrote a check with his mouth, and then cashed it in with his hands. Indeed, he knocked out Mendes in the second round, although there’s no confirmation that White accepted the bet.