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.
The main event of the evening will see the battle for the inaugural ONE Heavyweight Muay-Thai Championship. Incumbent ONE Light Heavyweight Kickboxing Champion and 2022 ONE Heavyweight Kickboxing Grand Prix Tournament Champion Roman Kryklia (49-7, 1 NC, 28 KOs kickboxing, 5-0, 4 KOs ONE Championship) seeks to become a two-sport titlist when he meets WBC Heavyweight Muay-Thai Champion Alex Roberts (14-3 Muay-Thai, ONE Championship promotional debut.)