By Harry Davies UFC 300 unfolds in Las Vegas tonight as Alex Pereira defends his light-heavyweight belt against Jamahal Hill at the mega-event. 12 current or former UFC champions are competing on the card, which kicks off with a bantamweight clash between Cody Garbrandt and Deiveson Figueiredo. Two-time Olympic gold medalist Kayla Harrison makes her UFC debut against Holly Holm whilst fan favourites Charles Oliveira and Jim Miller are also in action. Weili Zhang and Yan Xiaonan collide for the women’s strawweight title whilst a symbolic ‘BMF’ title fight between Justin Gaethje and Max Holloway…