Tomás Díaz Mendoza 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).