Barrios stops Karl to defend WBA 140lb title Photo: Esther Lin/Showtime WBA super lightweight champion Mario “El Azteca” Barrios (26-0, 17 KOs) successfully defended his title by sixth round TKO against a very game Ryan “Cowboy” Karl (18-3, 11 KOs) on Saturday night at the Alamodome in San Antonio, Texas. jQuery('body').append('