Correct me if I'm wrong, someone more knowledgeable will probably be aware of this- but wasn't there a show match between a top Japanese wrestler I think and Tyson/Ali I can't remember (I think the latter, for what it's worth) And the wrestler put him on his back and it showed he was like a fish out of water even with all that power once it hit the mat.
I'm going to look it up now, I also recall it being sort of kept out of mainstream media news. Please don't call me out on this it's from my vague memory- just trying to add to the topic!
thats pretty interesting, i found a link to an article about the fight between ali and the japanese wrestler
the fight was completely uneventful and was considered a draw. ali's boxing was completely nullified though as he only landed around 15 punches in 15 rounds, so i don't know how ali didn't lose.