#1. Jon Jones
Jon Jones is comfortably the greatest Mixed Martial Artist of all time. Another UFC pioneer who is actually still in his prime, Jones made his debut in the promotion in 2008.
He worked his way through the ranks before brutally knocking out Mauricio Rua to take the title in 2011. In doing so, he became the youngest champion in UFC history and took the first step in cementing his incredible legacy.
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Jones defended his title an incredible 8 times before being suspended for violating the UFC’s code of conduct policy. He came back and won the title again, defeating Alexander Gustafsson for a second time near the end of 2018.
If it weren’t for a disqualification and no-contest ruling, Jones would be a perfect 26-0 in his MMA career. He cemented his dominance over rival Daniel Cormier with a brutal knockout in mid-2017. Currently only 31 years old, expect the GOAT to keep increasing the gap.