Dustin Poirier is a former interim UFC Lightweight Champion that goes by the nickname “The Diamond.”He started fighting professionally in 2009 and is currently No. 2 in UFC's lightweight rankings and No. 11 in the men's pound-for-pound rankings. He’s faced Charles Oliveira, Conor McGregor, Dan Hooker, Khabib Nurmagomedov, and Max Holloway and has earned multiple Fight of the Night awards. In 2021, he took on Conor McGregor as a rematch of their 2014 fight and became the first person to beat McGregor by knockout, earning Poirier the Performance of the Night award. He then defeated Conor McGregor a second time at UFC 264 in Las Vegas. The Diamond faced Charles Oliveira for the UFC Lightweight Championship in 2021 at UFC 269 and was defeated in the third round. Dustin Poirier then beat Michael Chandler via submission in the third round during UFC 281 at Madison Square Garden on November 12, 2022. Dustin is set to fight Justin Gaethje for a second time at UFC 291 on July 29, 2023 in a battle for UFC's BMF belt.