#2. Quinton 'Rampage' Jackson vs. Rashad Evans - UFC 114
While this one may not be well known to more recent UFC fans, this non-title bout sold an enormous 1,050,000 pay-per-views in 2010. In theory, this bout was to determine the number one contender for the light heavyweight championship, although that failed to materialize after the event.
Quinton 'Rampage' Jackson was one of the first big stars in MMA. His entertaining fight style and personality made people want to see his bouts. On top of this, both men were former light heavyweight champions who strongly disliked each other and were just one win away from another crack at the belt.
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Rashad Evans ultimately won the bout via unanimous decision. He would then miss out on the promised title shot due to injury. However, he did get one more fight for the belt when he lost to Jon Jones at UFC 145.
#1. Dustin Poirier vs. Conor McGregor II - UFC 257
Conor McGregor is the biggest star the UFC has ever seen. He can fight virtually anyone on the roster and fans would still be willing to buy the pay-per-view. He has proven this over the years, drawing record numbers in his non-title pay-per-view bouts with Nate Diaz, Donald 'Cowboy' Cerrone and, most recently, Dustin Poirier.
This fight saw McGregor return after a year away from the sport and come back to the lightweight division where was a former champion. Poirier had clearly come a long way from his first bout with 'The Notorious' and had established himself as one of the top lightweights on the planet.
This bout sold 1,600,000 pay-per-views, tying the record set by Diaz vs. McGregor II. The trilogy bout between the pair also surpassed 1,500,000 pay-per-view sales, meaning this rivalry surpassed the two Diaz fights.
The second bout saw Dustin Poirier record a shocking second-round knockout before Conor McGregor broke his leg in the third fight between the pair. With both men now coming off losses in their previous outings, it will be interesting to see where they go from here.