You are completely delusional if you think that Tyson would stand more than a puncher's chance against a top MMA fighter. He would be taken to the ground and either submitted or ground-and-pounded. If we are talking about Tyson against top K-1 strikers, his chances are better but he would most likely be kneed to a coma. Stop being such a...Tyson fanboy.
SUCKMYMUSCLE
You understand differences in formats you ape loving fuckwit?
First of all the original post alludes to boxing. Overeem would get destroyed in boxing in less than a round.
Secondly k-1 is a limited format, not full muay thai, no thai clinch, so no knees. k-1 is becoming a refuge of shitty boxing with some kicks added. The heavyweight division is paper thin. If any of these guys could crossover to boxing they would.
Basically he would have to learn to check leg kicks.
In mma he gets taken down and subbed if he doesn't land straight away.
If you got second rate strikers like Carwin, Cain et cetera trying to work out of the clinch standing in mma they get knocked out.