Jairzinho Rozenstruik

Jairzinho 'Bigi Boy' Rozenstruik arrived in the UFC as a decorated kickboxer with frightening power, and he wasted no time proving it - a last-second knockout of Alistair Overeem rocketed him into heavyweight title contention almost immediately.

His right hand remains one of the most feared weapons in the division. He's knocked out the likes of Tai Tuivasa and Chris Daukaus, though his limited grappling has left him vulnerable to elite wrestlers and pressure fighters like Francis Ngannou and Jailton Almeida. That's settled him into the role of a dangerous gatekeeper: a threat to finish anyone on any given night.

For new fans, Rozenstruik is a quintessential heavyweight watch - a patient counter-striker who can turn a slow fight into a highlight-reel knockout in an instant. He's quiet outside the cage, but inside it, his power keeps every one of his fights one punch away from chaos.