Mosco de la Merced (Juan Valdez Valentino) is a Mexican Luchador or professional wrestler, best known for his time in Asistencia Asesoría y Administración (AAA) where he was a part of Los Vipers for many years. Before adopting the Mosco de la Merced ring name he worked for as Loco Valentino for over 10 years. He is a former holder of the Mexican National Tag Team Championship with Fuerza Guerrera and held the Mexican National Atómicos Championship four times with Histeria II, Psicosis II and Maniaco. His name roughly translates to "Mosquito of Mercy".