Top 10 of the 20th century in no particular order Mark Coleman- won the ufc heavyweight title, 2 UFC tournaments and the Pride World Grand Prix all inside the 20th century. He also left the 20th century considered the number 1 heavyweight in the world. He won the only tournament that Royce Gracie ever legitimately lost in. Dan Severn - UFC’s only triple crown champion. Won a super fight title, a tournament and an ultimate ultimate tournament. Ken Shamrock- The first UFC Superfight world champion