The main event will see a battle for the undisputed light heavyweight title, as defending champion Magomed Ankalaev puts his title on the line for the first time against the man he defeated to win it, former champ Alex Pereira.

Both men came in under the 205-pound championship limit, with each registering an official weight of 204.5 pounds for their title rematch.
The night’s co-main event will see reigning bantamweight world champion Merab Dvalishvili defend against Cory Sandhagen, with the champion tipping the scale at 135 pounds, while Sandhagen came half a pound lighter, at 134.5 pounds.

The remainder of the main card all weighed in on or under their respective weight limits, but there was one notable weight miss on the early prelims. Women’s bantamweight contender Macy Chiasson could only make 137.5 pounds for her bout with Yana Santos, who made weight at 135 pounds.
Chiasson was forfeited 25 percent of her purse to Santos and the fight will proceed as a catchweight bout.
The fighters later took to the stage and faced off for the final time at the ceremonial weigh-ins as the final pre-fight obligations were completed ahead of fight night in Sin City.
Check out the full list of official weights below.
UFC 320: Official weigh-in results
MAIN CARD
- Magomed Ankalaev (204.5) vs Alex Pereira (204.5)
- Merab Dvalishvili (135) vs Cory Sandhagen (134.5)
- Jiri Prochazka (206) vs Khalil Rountree Jr. (205)
- Josh Emmett (146) vs Youssef Zalal (146)
- Abus Magomedov (185.5) vs Joe Pyfer (186)
PRELIMINARY CARD
- Ateba Gautier (186) vs Treston Vines (185)
- Edmen Shahbazyan (185.5) vs Andre Muniz (185.5)
- Chris Gutierrez (136) vs Farid Basharat (136)
- Daniel Santos (151) vs JooSang Yoo (152.5)
EARLY PRELIMS
- Macy Chiasson (137.5)* vs Yana Santos (135)
- Patchy Mix (136) vs Jakub Wiklacz (136)
- Punahele Soriano (170.5) vs Nikolay Veretennikov (170.5)
- Ramiz Brahimaj (170.5) vs Austin Vanderford (170.5)
- Veronica Hardy (125.5) vs Brogan Walker (124.5)









