Who are the greatest world heavyweight boxing champions? 1. Muhammad Ali (fine all around, revolutionary defensive heavyweight fighter, smart, courageous) 2. Rocky Marciano (The Brockton Blockbuster - powerful, smart, courageous - would have been number 1 but for his lack of size) 3. Jack Johnson (The Galveston Giant - breakthrough style, smart, great defense, possibly the first of the “modern style” heavyweight champions) 4. Joe Louis (The Brown Bomber - great, great puncher, fine boxer, one of the two quintessential heavyweight champions) 5. Larry Holmes (good all around) 6. George Foreman (devastating puncher, amazing guy) 7. Jack Dempsey (The Manassa...