Answer
Justin Gaethje won the UFC Interim Lightweight Championship by defeating Tony Ferguson in the main event of UFC 249 on May 9, 2020. The fight was a back-and-forth affair, with both fighters landing heavy strikes. Gaethje eventually wore Ferguson down and finished him with a triangle choke in the fifth round. This victory earned Gaethje a title shot against Khabib Nurmagomedov, who was the UFC Lightweight Champion at the time.