#4 Jon Jones
If it weren't for his messed up personal life, Jon Jones would’ve probably been on top of this list. He started his professional MMA career back in 2008 and was an immediate hit in small promotions. Six fights into his career, Jones managed to get into the UFC and there was no looking back. He embarked on an extraordinary journey in the promotion and became the youngest fighter to win a UFC championship belt when he defeated Mauricio Rua at UFC 128.
Jones then went on to fight names like Rashad Evans, Lyoto Machida, Quinton Jackson, Vitor Belfort, Chael Sonnen and Daniel Cormier among others. He won all these fights and the only loss that he has on his 23-1 professional record came due to an illegal elbow. This stat is enough to show the dominance of Jones inside the Octagon.
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If we keep the drug busts and personal issues aside, Jones is an exceptional talent. And the best part is: he still has plenty of years ahead of him to make a bigger impact.