#2 Amanda Nunes (16-4)
The Lioness was criminally ignored in the build-up to her fight against the returning Ronda Rousey at UFC 207. She was relegated to being an afterthought and was made to look like the fighter who was expected to be the springboard for Rousey's rise back to the top.
Nunes though didn’t abide by the script. The Brazilian smashed Rousey in a 48-second affair to etch her name in the history books as one of two women to have beaten Rowdy; convincingly.
The openly lesbian fighter won the title from Miesha Tate at UC 200 and has defended her title thrice against Rousey, Shevchenko, and Raquel Pennington respectively. She is on a 7-fight win streak with her last defeat coming at the hands of Cat Zingano in September 2014.
A black belt in Brazilian Jui Jitsu, Nunes is relentless in the Octagon and her aggressive style coupled with her win against Rousey has transformed her into a household name. In hindsight, Rousey already knew how to put someone over even before she left for the WWE.
Nunes may have the record, accomplishments and skill set but there is one scary woman who she would have to beat in order to stake the claim for being called the greatest of all time…