But we still have Tony and Khabib. Maybe one of them can win against Conor, who knows. I don't know if is will be the biggest fight in history if they ever fight in Russia, but hey, the 4 out of 5 top selling UFC PPV's was headlined by Conor(except #2 Lesnar vs Mir) and he still holds the record against Nate.
I think Tony and Khabib will beat Conor and then he could retire for good from MMA or he will go down and challenge the 145 pound champion once again, but there is also a change that after two defeats he will call out Paulie for a boxing match.
. Lesnar and Conor are the biggest pay per view stars and i think the record is with Lesnar .
I still think that Khabib has a high chance to win and beat Conor more than Tony is. I have nothing against Tony, but Khabib is a different animal and can overwhelm Conor in my opinion.
As for the PPV records:
Event Main Event Date PPV Buys
UFC 202 Diaz vs. McGregor Aug 20, 2016 1,650,000
UFC 196 McGregor vs. Diaz Mar 5, 2016 1,600,000
UFC 100 Lesnar (c) vs. Mir Jul 11, 2009 1,600,000
UFC 205 Alvarez (c) vs. McGregor Nov 12, 2016 1,300,000
UFC 194 Aldo (c) vs. McGregor Dec 12, 2015 1,200,000
Source:
https://en.wikipedia.org/wiki/List_of_UFC_records#Highest_Pay-Per-View_buys[citation_needed]