#3 Brock Lesnar
Brock Lesnar’s run in the UFC was an interesting one. He came into the promotion with a lot of hype due to his professional wrestling background. And this is perhaps the reason why UFC wanted to push him to the top. Lesnar got a shot at the UFC Heavyweight championship after winning just one fight in the promotion.
He then retired from the sport in 2011 due to injuries with a professional record of 5-3 to his name. Five years later, in 2015, Lesnar announced his return to the Octagon and he was pitted up against Mark Hunt at UFC 200.
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The fight went the distance and Lesnar came out on top via a unanimous decision. However, he tested positive for estrogen blocker- Clomiphene and his win over Hunt was overturned. Along with it, Lesnar was suspended for one year and fined $250,000.