[1] His family moved to Mexico, and Guerrero's father used his English-language skills to work as an interpreter in Guadalajara.

[6] In the late 1940s, Guerrero began tag teaming with El Santo as the undefeated La Pareja Atómica (The Atomic Pair).

[12] In 1954, he wrestled a championship match against NWA World Heavyweight Champion Lou Thesz but did not win the title.

[2][6] Guerrero broke away from EMLL in 1966 after refusing to drop the NWA World Light Heavyweight Championship to Ray Mendoza.

Guerrero is credited with the invention of La de a Caballo (Camel Clutch) and the Gory Special, a type of backbreaker[3][11] stretch hold which has been modified into a facebuster move (Gory Bomb), a piledriver (Barry White Driver), a powerbomb (Stu Hart Special), a reverse STO (The Deal) or a neckbreaker/backbreaker (Widow's Peak).

3This title would later be recognized by the NWA, though Guerrero's reign with it occurred prior to the formation of the National Wrestling Alliance.