Conor McGregor was so confident in his ability he once offered to strike a wager which would have earned him $6million.
McGregor was preparing to face Jose Aldo in 2015 when the Brazilian injured his ribs in training and pulled out.
In stepped Chad Mendes at short notice, a fighter who presented a very different challenge to McGregor.
But the Dubliner dismissed any suggestion that he would come a cropper – and was ready to put his money where his mouth was.
UFC president Dana White recalled: "You want to know how confident this kid is? I can't even believe I'm going to say this, but, he told Lorenzo and I the other day, 'I'll bet you $3 million I knock him out in the second round.'
"I like to bet, I don't know if I'm that willing to take that bet. When I tell you how extremely confident this guy is in himself, it's fascinating. He is a very unique, fascinating person to listen to. Fun to listen to, and fun to watch."
McGregor went on to stop Mendes in the second round having overcome early difficulties in the fight.
He then went on to face Aldo five months later – and KO'd the featherweight world champion in just 13 seconds.
McGregor is now preparing for a rematch with Dustin Poirier which takes place on Sunday morning in Abu Dhabi.
And since beating Mendes, he has raked in money beyond his wildest dreams to become one of the richest sportsmen in the world.
And the 32-year-old has vowed to stop Poirier in double-quick time this weekend.
“I love Dustin, he’s a good fighter, he's even a great fighter, but great is still levels below me," he said. "I will knock Dustin out inside 60 seconds."
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