#4 - Bret Hart
The best there is, the best there was and the best there ever will be. Bret "The Hitman" Hart is one of the greatest competitors to ever step foot inside the squared circle and we've got to believe that he can replicate that kind of form when it comes to mixed martial arts. After all, his background in the Hart Dungeon wasn't likely to be the easiest ride of his life.
Bret can handle himself pretty well when it comes to a fight, as exampled by his knockout blow on Vince McMahon following the Montreal Screwjob. Okay, that might be a ridiculous example but when you look at Bret he just looks like a guy who can fight and if MMA was as popular back in the day as it is now, the Hitman would have transitioned into the sport quite nicely.
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From one legend to another.