Georges St. Pierre and B.J Penn
Throughout his career (whether it is over or not) GSP didn’t really beat up too many people. He won a lot of fights, and was a dominant champion, but very few of his fights would anybody ever consider as violent.
His rivalry with BJ Penn however, is the exception. After winning a split-decision against Penn at UFC 58, the two would meet again in a champion vs champion super-fight at UFC 94. Some remember this fight for GSP’s corner putting vaseline on his back, but more remember it as the time BJ Penn got beat up so badly he couldn’t answer the bell for the final round.