#1 Cris Cyborg

Akin to the aforementioned Jon Jones, Cris Cyborg (20-1-1) has indeed tested positive for banned steroids/PEDs over the course of her long and storied Mixed Martial Arts career. However, Cyborg is unanimously regarded as one of the greatest talents, male or female, to have ever graced an MMA cage.
Cyborg is the reigning, undisputed UFC Women's Featherweight Champion, and possesses dangerous striking that's amplified to scarier levels when you are to consider her excellent grappling skills. For long, Cyborg was regarded as one of the best fighters in the world, with the only criticism being that she's way too much of a slugger rather than a refined striker.
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Nevertheless, that seems to have changed as of late, particularly due to her work with famed boxing/MMA coach Jason Parillo. We cannot refute the fact that certain sections of the combat sports community disregard Cyborg's accomplishments due to her failed PED tests, however, when you look at her combat skills and track record in the MMA realm, it's crystal clear that she is indeed one of the greatest fighters of all time.
Which other fighters do you think deserve a mention on the UFC pound for pound greats list? Sound off in the comments!