#2. ONE Championship flyweight world champion Adriano Moraes
ONE Championship flyweight world champion Adriano 'Mikinho' Moraes has never been knocked out in his storied decade-long career. He's faced some of the most savage assassins inside the circle, from knockout punchers to Wushu experts to renowned kickboxers.
In fact, 'Mikinho' has never truly been dominated in a fight, ever. All of his losses came by way of razor-close split decisions. This proves how great and undeniably tough this Brazilian buzzsaw is.
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Perhaps one of the major factors why Moraes' opponents could never put him away is because he almost always pushes them on their backpedal. Known for his dangerous Brazilian jiu-jitsu black belt skills, Moraes always makes his opponents worry about his grappling.
The ONE Championship flyweight world champion would always force his foes backwards with his takedown attempts mixed with his surprisingly effective striking.
This way, his opponent's could never get a clean, powerful shot in. Still, in the rare times that he does get hit by clean power shots, Moraes would eat them like they're breakfast. You can't be imposing your grappling and takedown game against a striker without expecting to get hit. Moraes' granite chin allows him to use his grappling effectively.
#1. ONE Championship flyweight Muay Thai world champion Rodtang Jitmuangnon
Hardcore fans call him "Rodtank" for a reason. To describe ONE flyweight Muay Thai world champion Rodtang Jitmuangnon's legendary chin, all we need to do is show you this video and that would be it:
Rodtang literally puts his hands down and asks his opponents to hit him on the chin multiple times. ‘The Iron Man’ is more like the "Incredible Hulk" in all honesty. The more you hit him, the angrier and more dangerous he gets.
He smiles every time he gets hit hard as if he enjoys it. It's just frightening if you're the guy trying to put him away. It's almost as if the only way to beat this man is to avoid hitting him hard at all costs.
Having already fought over 300 times before the age of 25, Rodtang hasn't been hurt by strikes in over a decade. The only time he's ever been stopped via strikes happened when he was just starting his career out.
Even so, considering how many times he's already fought and the caliber of fighters he's locked horns with, it's quite hard not to put him at the top of this list.