UFC 242: Khabib vs. Poirier was a mixed martial arts pay-per-view event produced by the Ultimate Fighting Championship that was held on September 7, 2019 at The Arena, Yas Island in Abu Dhabi, United Arab Emirates. A UFC Lightweight Championship title unification bout between current champion Khabib Nurmagomedov and interim champion Dustin Poirier served as the event's headliner.