#2 Conor McGregor vs Nate Diaz 2 - UFC 202 - 1.65 million buys
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The most anticipated rematch in UFC history didn't need any titles on the line. They were originally scheduled for UFC 200, but due to Conor McGregor's refusal to attend certain press conferences, UFC decided to set an example and pull the fight from the card.
They were shifted to UFC 202, and it didn't seem to hamper PPV sales at all. They had their rematch at Welterweight, as McGregor only thought it to be fair that he beat Nate Diaz at the weight that Diaz beat him.
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The build-up saw a lot of tension between the two and they gave everything they had in a five-round war, a fight that turned out to be an instant classic. This time, it went the distance and McGregor avenged his loss with a majority decision.
The rematch will undoubtedly shatter this number as well.