For me Johnson vs Jeffries. Louis vs Schmelling 2. For all the wrong reasons and Max was a good guy. Ali vs Quarry 1. Tunney vs Demsey. Ali vs Foreman. Ive kept it to the heavyweight because at one time this division would make the world stand still.
I'm basing this on the most highly anticipated fights, in no particular order: Leonard vs Hagler Ali vs Frazier Lewis vs Tyson Tyson vs Holyfield Louis vs Schmeling 2
Sometimes you set out to prove something. Only to, in all likely-hood, manage to disprove it. But I thought I'd show the numbers anyway. As I suggested in my post though. It may not be too hard in this generation of almost world wide PPV etc to surpass the Ali vs Frazier fight $$$ wise. But as for overall size and impact of a fight Ali vs Frazier I is probably still the daddy of them all.