siphotos:

Muhammad Ali and Ken Norton exchange blows during their 1973 fight in San Diego, the first of their three bouts against one another. Ali would wind up losing a 12-round decision after Norton broke his jaw early in the fight. (Neil Leifer/SI)&nbsp;
SI VAULT: Ali looking for revenge after broken jaw against Norton (4.23.73)GALLERY: Tribute to Muhammad Ali&nbsp;| Ali&rsquo;s Greatest Fights