9: Stan Hansen
Perhaps a bigger star in Japan than he ever was in his home country of the United States, Stan "the Lariat" Hansen had loads of real world toughness.
On one of his first matches in the Land of the Rising Sun, Hansen had four teeth kicked out of his head. As he put it, if such a thing had happened in the US, there would have been firings and lawsuits, but in Japan it was just another night. Hansen finished the match and visited a dentist in the morning--after spending the night out drinking with his wrestling buddies!
Sometimes another wrestler would try to work 'stiff and snug' with Hansen, meaning the punches and kicks were much harder than is normal for pro wrestling. Hansen would readily meet their might with his own, leading to some of the best brawls in wrestling history, like his classic bouts with Big Van Vader.
And speaking of the man they call Vader...