The boxing star is coming out of retirement to take on the Irish UFC fighter and he's widely expected to get the better of the mixed martial arts expert in Las Vegas on August 26.
Mayweather is risking his proud 49-0 unbeaten record and is confident he will dispose of the novice boxer quickly in the ring.
"He’s looking forward to ending the fight early, I’m looking forward to ending the fight early - it won’t go the distance," the 40-year-old said.
"It’s not really watching fight tapes, it’s about knowing the person you’re facing across the ring from your. You want to know what they like to eat, what they’re doing when they’re not in camp."
The organisers said on Friday that they expect the hugely-anticipated showdown to break box office records, such is the demand for fans to see it - both live in Vegas and across the globe on TV - and Mayweather knows the pair must deliver on the night.
He added: "This isn’t just a fight. This is an event. We both owe the fans and everyone tuning in a lot of excitement. That’s what we’re there to give them."