cassius-clay

In one of the most iconic and controversial moments of his career, Muhammad Ali stands over Sonny Liston and yells at him after knocking the former champ down in the first round of their 1965 rematch. Skeptics dubbed it “the Phantom Punch,” but films show Ali’s flashing right caught Liston flush, knocking him to the canvas. Refusing to go to a neutral corner, Ali stood over Liston and told him to “get up and fight, sucker." Ali, the heavyweight boxing legend who fought opponents in the ring and on behalf of social justice outside of it, has died at 74 years old. (Neil Leifer)

GALLERY: SI’s 100 Greatest Photos of Muhammad Ali

50 years ago today, 22-year-old challenger Cassius Clay (Muhammad Ali) battered the heavily favored heavyweight champion Sonny Liston in a bout that shook the boxing world. The fight ignited the career of one of sports’ most charismatic and controversial figures, whose bouts often became social and political events rather than simply sports contests. (Neil Leifer/SI)

GALLERY: Muhammad Ali vs. Sonny Liston I

GALLERY: SI’s 100 Greatest Photos of Muhammad Ali