Joseph "Sandy" Saddler was an American professional boxer. He was a two-time featherweight world champion, having also held the super featherweight title. Over his twelve-year career (1944–56), Saddler scored 104 knockouts and was stopped only once himself, in his second professional fight, by Jock Leslie. Considered to be one of the hardest hitting featherweights, Saddler was ranked number five on The Ring magazine's list of "100 Greatest Punchers of All Time". His nephew is Grandmaster Flash.

A knockout is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, muay thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking, as well as fighting-based video games. A full knockout is considered any legal strike or combination thereof that renders an opponent unable to continue fighting.