[2] When old enough Guzmán began training for his professional wrestling career alongside his younger brother Rodolfo, who later became known as El Santo.

Black Guzmán was initially a bigger star than his younger brother Rodolfo as he pioneered a high flying, fast-paced style of wrestling focused around the headscissors takedown.

[2] On December 16, 1941, Black Guzmán defeated Tarzán López to win the World Middleweight Championship, one of the top titles in Mexico at the time.

[5] Two years later Guzmán won a tournament to become the first ever Mexican National Light Heavyweight Championship in March.

[6] By the mid-1940s Guzmán had started working across the border in Texas for Southwest Sports, Inc. (Later World Class Championship Wrestling), run by Ed McLemore.

[8] On April 4, 1951, Guzman wrestled then World Heavyweight Champion (LA Version)[9] "Baron" Michele Leone at the Los Angeles Olympic Auditorium.

Guzmán and Romero joined forces twice more to win the Tag Team title, defeating Duke Keomuka and Mr. Moto.