Pablo Fuentes Reyna (December 31, 1956 – January 12, 2012) was a Mexican luchador (Spanish for professional wrestler) best known under the ring name MS-1 (MS Uno). As MS-1, Fuentes was a founding member of the wrestling group called Los Infernales (the Infernals) and achieved most of his success as part of the group, including being the first-ever Mexican National Trios Champions and the first-ever CMLL World Trios Champions. Fuentes' son is also a professional wrestler working as MS-1, Jr. or MS-Jr.