Josh Hedges / UFC / Getty
A lot has changed since Conor McGregor and Dustin Poirier fought in 2014 as up-and-comers in their mid-20s.
McGregor has emerged as the biggest star in mixed martial arts. Both captured UFC gold in the years since and have moved up to the lightweight division. And as it stands right now, they're two of the best 155-pound fighters on the planet.
Though McGregor knocked out Poirier in the first round at UFC 178, Saturday's UFC 257 main event in Abu Dhabi, United Arab Emirates, is a much different matchup than the one that took place seven years ago.