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Your link to sports history, one photo at a time. Curated by Andy Gray and Dave Kaye.

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

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

Muhammad Ali stands over Sonny Liston after knocking him out in the first round of their 1965 fight. Ali turns 72 today. (Neil Leifer/SI)

Muhammad Ali stands over Sonny Liston after knocking him out in the first round of their 1965 fight. Ali turns 72 today. (Neil Leifer/SI)

Former heavyweight champion Muhammad Ali stands on top of SONNY LISTON rock during a 1991 SI photo shoot at his old training camp cabin in Deer Lake, Penn. (Neil Leifer/SI)  

GALLERY: Classic Muhammad Ali Photos

Former heavyweight champion Muhammad Ali stands on top of SONNY LISTON rock during a 1991 SI photo shoot at his old training camp cabin in Deer Lake, Penn. (Neil Leifer/SI)  
GALLERY: Classic Muhammad Ali Photos

Muhammad Ali stands over Sonny Liston after knocking him out in the first round of their 1965 fight. Ali turns 70 today. (Neil Leifer/SI)

GALLERY: Classic Photos of Muhammad Ali | Ali at 70
VIDEO: Boxing historian Bert Sugar on greatness of Ali
SI VAULT: Ali beats Frazier in Manilla (10.13.75)

Muhammad Ali stands over Sonny Liston after knocking him out in the first round of their 1965 fight. Ali turns 70 today. (Neil Leifer/SI)
GALLERY: Classic Photos of Muhammad Ali | Ali at 70VIDEO: Boxing historian Bert Sugar on greatness of AliSI VAULT: Ali beats Frazier in Manilla (10.13.75)

Muhammad Ali leans in to get a close look at the scale during the weigh-in prior to his 1965 fight against Sonny Liston. (Neil Leifer /SI)

SI VAULT: Ali’s punch was so fast no one believed it (6.7.65)

Muhammad Ali leans in to get a close look at the scale during the weigh-in prior to his 1965 fight against Sonny Liston. (Neil Leifer /SI)
SI VAULT: Ali’s punch was so fast no one believed it (6.7.65)