UFC President Dana White said the fighter "is absolutely confident that he will win".
Floyd Mayweather Jr. will come out of retirement to meet UFC star Conor McGregor in an August 26 boxing match that will feature two of the top-selling fighters in the world. Boxing gloves are significantly heavier at 10 ounces, made for heavy contact.
White said plans are in the works to have the fighters go on a promotional tour of major U.S. cities.
The Hartlepool fighter will box on the undercard of the ground-breaking fight between the unbeaten boxing champion and the UFC star.
Espinoza said the fight came together quickly after McGregor and the UFC reached agreement last month on their end of the deal and Mayweather's team pushed for the fight in recent days.
White on if this will break the PPV record: "I think this breaks the record in United States, the UK, Australia and Canada, too".
The cost of tickets and the price of the pay-per-view has not been decided, though the pay-per-view is expected to be at or near the $99.95 charged for Mayweather's 2015 fight with Manny Pacquiao that drew a record 4.4 million pay-per-view buys.
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And so far flights from Dublin to Las Vegas at that time are going relatively cheap - with McGregor enthusiasts snapping up trips to Las Vegas for just €600. That's insane. I'm a fight fan and when you're a fight fan, you want to see a great fight. "So he'll fight twice this year".
"It's going to be great boxing on the same card as Pacquiao, who has always been a hero of mine", said Conlan.
Even if the actual bout may not shape up as a great matchup, the run-up to the fight will. "I'm just simply the best fighter, that's it".
Both fighters are allegedly making at least $100 million dollars each for this fight.
"It's insane, I read all these posts where people say Mayweather's gonna have his hands full landing on Conor because of Conor's skill and footwork and movement", he said.
Other non-boxing fans may recognise Ranallo as the former lead announcer for WWE Smackdown, though the Canadian departed in March 2017 for personal reasons. The UFC has no production role in the match, with Showtime Sports and Mayweather Promotions partnering to produce the event.
This could be the biggest money fight of our generation. "I'm not here to promote their fight but I think that the attention that all us fighters are getting - you know, we're asked about it every time we do an interview from mainstream media - I don't think that's a bad thing".