Villano IV

[2][5] He spent the first couple of years in wrestling working as various enmascarado characters such as Leopardo Negro III and Super Maquina Jr.[2] In 1983, Díaz was finally given the mask and the name of his brothers and became Villano IV.

[7] Villano IV and V began working for World Championship Wrestling (WCW) as part of the influx of luchadors in 1996.

Villano IV made his debut at the 1996 World War 3 event as part of the Three Ring, 60 man battle royal.

[9] The brothers played the role of a heel and would occasionally cheat by switching places while the referee was distracted (all Villanos wore identical attire, aside from their Roman numeral distinctions).

[10] They also worked an eight-man tag match at Clash of the Champions XXXV, alongside Psychosis and Silver King against Juventud Guerrera, Super Calo, Héctor Garza and Lizmark Jr.[11] Villano IV also wrestled in WCW, unmasked, under the ring name "Ray Mendoza Jr."[3] (in honor of his father), many years before his brother Villano V began using the ring name in Mexico.

Following their stint in WCW, Los Villanos returned full-time to Mexico where they began working for Consejo Mundial de Lucha Libre (CMLL).

Villano IV was the cornerman for V's biggest Apuesta win as he defeated and unmasked Blue Panther as part of the CMLL 75th Anniversary Show.

[2] Díaz was adamant that his sons get a good education instead of becoming wrestlers, wishing that they become lawyers or doctors as he wanted to spare them the physical suffering he experienced himself.