Ali is the Greatest heavyweight ever IN the ring because he was suposedly suposed to have no chance to win against liston ...and TEN whole years later against Foreman who also was suposedly unbeatable...then held the titles for 4 years ...and he did what he did against joe frazier and every other top 10 heavyweight in the 15 years he fought ....

also hes the "Greatest " because before those "un-winnable" fights when experts expected him to get destroyed he told them hed win Because he the greatest ...he never had a loss that was not revenged twice untill he was 39 and had parkinsons

Also he was 1st to win the titles 3 times and was the best in the division at any given time between 1963-1977