Prime for Prime MMA match with no rules (aside from obvious stuff like no low-blows or biting) and 0 transition training. Both will resort to just the combat knowledge they have from their own sport. Match happens shortly after 1988 Summer Olympics. Tyson had just beaten Michael Spinks and Karelin captured the Olympic Gold. Both champions face off to find out who's the baddest man on the planet. Who would you put your money on, leaving any fanboyism aside?