Conor McGregor's UFC 257 clash with Dustin Poirier over the weekend reportedly secured 1.6million pay-per-view buys.
A report in the Sports Business Journal claims 1.2million people bought the fights in the United States, while there were 400,000 PPV buys outside of the US.
Those figures put UFC 257 viewing figures up there with the McGregor-Diaz rematch at UFC 202 in August 2016, which reportedly raked in around 1.65million PPV buys as the Dubliner avenged defeat in a classic at the T-Mobile Arena.
The reported figure would put the pay-per-view alongside UFC 202 as the joint second-most bought UFC pay-per-view ever.
And McGregor would hold a stake in every one of the UFC's top five best selling PPVs of all time.
Khabib Nurmagomedov's win over McGregor in October 2018 at UFC 229 is still unrivalled as the most-watched event in UFC history - with around 2.4million pay-per-view viewers tuning in on that occasion.
While the Crumlin man's fights with Donald Cerrone and the first clash with Nate Diaz round out the top five, both pulling in just over 1.3 million buys.
The Notorious was stopped in the second round of his rematch with Poirier on Sunday in Abu Dhabi.
But having won the first fight between the pair in 2014, McGregor wants an immediate trilogy bout to determine the next 155lbs champion.
"He's already harassing everybody to get the rematch; he'd love the rematch and I don't think Dustin is against that," McGregor's head coach John Kavanagh told ESPN.
"If we can get that before the summer that would be amazing; if it's not be then maybe he drifts off into boxing.
"We're one and one, we gave him the rematch and I hope he returns the sentiment
"If the fight had gone our way it would have been nice to look at Nate Diaz for the belt but this is the one that lights the fire in him.
"I was looking for him on the yacht and he was in the gym doing an hour-long tough weights workout; that shows you where he is in the head.
"That's the big drive, that's the story, it's one apiece. They're right up there in the rankings, they're popular fighters and its a beautiful match-up.
"Dustin is riding high with confidence, I'm sure his confidence is super-high. We need to fix that technique with the leg and another couple of things as well, but Dustin vs Conor III for the belt in May would be amazing."
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