Foreman, easily. No one else is close.

Rocky is a candidate for top Five punchers but he was an over-rated mafia Boy so we'll never know. He fought old men and fought in a very weak era.

Lewis has an amazing right hand but he didn't have Rocky's balls so we don't know how good he was.

1. Foreman
2. Wills
3. Dempsey (He probably wasn't but he fucking well went for it)