I think fo rme the most feared fighter was Marvin Hagler , here are the reasons why.

1. The best chin for me in history.
2. Adaptable style , could box slugger eg. Roldan. Slug with boxers eg. Hearns.
3. Good Power .
4. Could fight for 15 rounds at a good pace .
5. He look such a mean mutha , with a great stare , must have really put the fighteners up his oponants.

The main point i like about Marvin , is although he was regarded as a mean - hardman of a fighter , he never talked trash like a James Toney for example.
TOP GUY , GREAT FIGHTER , AND A REAL INTIMADATING GUY.