A major heavyweight fight is a rare sight in MMA, but UFC 220's headliner between champion Stipe Miocic and Francis Ngannou is as big as they come.
Miocic is trying to become the first man in the division to defend the belt three times in one title reign. Ngannou wants to prove that he's the next big thing in the sport. It's a storyline that will drive the action on Saturday night.
Light heavyweight champion Daniel Cormier will also defend his belt against a powerful up-and-comer. Volkan Oezdemir, fresh off of two sub-minute knockout wins, will look to take the beltaway from DC.