Tomás Díaz Mendoza (born April 9, 1965) is a Mexican professional wrestler, better known by his ring name Villano IV (Villano Cuarto). Within the stable Los Villanos, he has wrestled for Universal Wrestling Association (UWA), AAA, and World Championship Wrestling (WCW). While popular and successful in Mexico, he frequently performed as a jobber in WCW. The other sons of Ray Mendoza who have used the name "Villano" include Villano I, Villano II, Villano III (Arturo Díaz Mendoza), and Villano V (Raymundo Diaz Mendoza). Professional wrestling career Díaz began wrestling in 1982 after being taught by his father and his older brother Arturo. He was not given the Villano name on his debut, both his father and his older brothers wanted him to get a college degree and also earn some in-ring experience before he would be allowed to use the Villano name. He spent the first couple of years in wrestling working as various enmascarado characters such as Leopardo Negro III and Super Maquina Jr. Villano IV In 1983, Díaz was finally given the mask and the name of his brothers and became Villano IV. He immediately began teaming with his brothers, especially Villano I and Villano V, and engaged in a heated and very popular feud with the trios team of Los Brazos (Brazo de Plata, Brazo de Oro. and El Brazo). On October 21, 1988, Villano I, IV, and V defeated Los Brazos in a Lucha de Apuesta, Mask Vs Mask match and thus unmasked Los Brazos. Over the years Villano IV and his brothers have worked for Universal Wrestling Association (UWA), AAA and Consejo Mundial de Lucha Libre (CMLL) and with shorter runs with International Wrestling Revolution Group (IWRG) and World Wrestling Association holding tag team and Trios titles in all federations. World Championship Wrestling (1996–2000) 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. Subsequently, Los Villanos worked mainly the weekend shows such as WCW World Wide and WCW Saturday Night. 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). Los Villanos made a couple of appearances on WCW's main shows