#3 Brock Lesnar
The Beast Incarnate is a former UFC Heavyweight Champion with a record of 5 wins, 3 losses, and 1 draw. The statistics itself should tell you why Lesnar is on this list. The highly accomplished freak of nature may have brought in tons of buzz for the UFC during his time with the promotion but it also exposed the biased matchmaking activities of the biggest promotion in the world.
The former WWE Champion lost to Frank Mir in his UFC debut but was suspiciously granted a title shot after notching up a solitary win against Heath Herring. He won the Heavyweight title against a worn out 45-year-old Randy Couture and walked around as the baddest man on the planet
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He did follow it up with a redemptive annihilation of Frank Mir at UFC 100. In his next title defense, Lesnar submitted the then-undefeated Shane Carwin, however, the win was majorly due to Carwin mistakably gassing himself out in the first round itself.
Lesnar was then pitted against Cain Velasquez – a man of his size and arguably greater skill. Cardio Cain imposed his technical superiority on the 'Jacked-up White Boy' and finished the fight in the first round. Lesnar’s misery continued as he was TKOed in his next fight by the towering Alistair Overeem.
And just like that, the former NCAA I All-American's lucrative first stint with the UFC came to a brutal end which was later on attributed to his well-documented struggle with Diverticulitis. Lesnar eventually returned at UFC 200 to beat Mark Hunt, only to see the win being converted into a no-contest after he tested positive for Clomiphene.