#2. Alex Pereira
Alex Pereira might evoke memories of Jiří Procházka's extremely short journey from UFC debutant to reigning champion.
However, the difference between the two fighters is that Procházka was a veteran of 30 MMA fights before signing with the UFC. Pereira, meanwhile, has only seven MMA fights to his name and will likely challenge Israel Adesanya for the middleweight championship in only the Brazilian's fourth UFC fight.
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What 'Poatan' lacks in MMA experience, however, he makes up for with kickboxing experience.
A highly successful kickboxer with one of the most powerful left hooks in combat sports history, Pereira is the first two-division champion in Glory history with 33 wins across 40 kickboxing bouts.
'Poatan' now works on his grappling with former light heavyweight champion and highly skilled Brazilian jiu-jitsu black belt Glover Teixeira. Pereira will be eager to prove anyone who doubts his MMA skill-set wrong.
#1. Brock Lesnar
Current WWE Superstar Brock Lesnar is a former UFC heavyweight champion. He was once recognized as the sport's biggest pay-per-view draw during the peak of his MMA career.
When Lesnar left the world of professional wrestling to pursue a career in American Football, he seemed destined for a life in relative athletic obscurity. His attempts at an NFL career were largely unsuccessful despite his athletic gifts. He then made a brief return to professional wrestling by signing with New Japan Pro Wrestling.
After turning his back on professional wrestling for a second time, the former NCAA Division I champion pursued a career in mixed martial arts. With only one fight on his record, he signed with the UFC, losing to Frank Mir in his debut bout with the promotion.
However, after defeating Heath Herring in a rebound matchup, Lesnar faced Randy Couture for the heavyweight championship in only his third fight with the promotion, winning the title in his fourth MMA fight in an unprecedented series of events.