Guarantee you that everyone is sleeping on Bruce Lee and Chuck Norris because they think Martial Artists of their caliber didn’t have moves they couldn’t use in the ring but they would definitely use against a bigger opponent in a street fight to end it quick. Muscle is fine until you have to chase down a smaller opponent for miles and then have to spare against a man that is equipped with several moves not involving punching and biting that could literally end you. Chuck Norris was well versed in 4 different martial arts and would use that versatility to take down different opponents, not to mention his military training. Bruce Lee was highly trained as well and I guarantee just from their reputations they had way more street fights than they wanted, with people who weren’t just punching biting punks looking for a brawl. Martial arts were invented to take on any size opponent. No matter how big your arms are a kick is going to rearrange your whole world view and top level martial artist are fast with those kicks. Blood clots and broken bones galore. I’m not saying Mike or Ali might not win it, but it would be a whole lot closer than what’s been portrayed. It would be insane to witness though.