Mike Weaver vs. John Tate because Weaver lost every round until John Tate lost focus in the fifteenth round at the last minute and became the ex heavyweight titlist.
Edwin Rosario vs. Hector Camacho. He was the one responsible for Macho's non involving style by hitting him so hard he stayed on his bicycle for the rest of his career. Rosario did win the lightweight title later.
George Foreman should have fought Ali his very next fight but then we may not have seen the nice guy that gave us that wonderful grill. Doug Jones should have had an instant rematch after losing by a point to Muhammad Ali.
George Foreman and Ron Lyle should have done it one more time because those five rounds were electrifying. Of course I still think Hagler could have walked over Ray Leonard in the rematch that never came to pass.