Genaro Jacobo Contreras is a retired Mexican professional wrestler, or Luchador in Spanish, and is a professional wrestling trainer for Consejo Mundial de Lucha Libre (CMLL). Contreras is best known under the ring name Ringo Mendoza, which he has used since his debut in 1968. Contreras has three brothers who were also professional wrestlers, Pedro Jacobo Contreras who worked as Cachorro Mendoza ("Cub Mendoza"), a brother who wrestled as Indio Mendoza and a third brother known under the ring name "Freddy Mendoza". Mendoza wrestled his last match in 2011, transitioning to being a full-time trainer instead.