First and only name that came to mind for me. Man, I miss Mercer fights, he always brought some action. Loved the jab he developed later on in his career.
Mercer had a very solid chin. That ko of Morrison was one of the worst I've seen. What was the ref thinking?
Mercer is the only guy I can think of that did it for sure. Leon Spinks came close I think? I know he iced the Sixtro Soria of Cuba in the third round and had 133 ko's out 178 wins as an amateur. That guy was a beast before the drugs and alcohol wrecked his life.