Ranked fighters will take to the famous UFC Octagon at the top of the slate, starting with the UFC on ESPN+ 91 co-main event of the evening, where the focus is on the light heavyweight division. No. 8 contender Anthony Smith (37-18 MMA, 12-8 UFC) makes his 56th career appearance versus No. 11 contender Khalil Rountree Jr. (13-5, 1 NC MMA, 8-5, 1 NC UFC) in the co-headliner.