Zab Judah, July 23, 2011, ko 5th
The American was in his fourth reign as a world champion, but Khan, then trained by Freddie Roach, was at his brilliant best, dominating and bamboozling Judah before knocking him out with a body punch in the fifth round, to unify the WBA and IBF super-lightweight titles. Getty Images

Amir Khan's five greatest victories ahead of Terence Crawford title fight - in pictures