Juan Francisco Domínguez (September 8, 1977) is a Mexican luchador or professional wrestler, currently performing under the ring name X-Fly. He is also known as the original Mosco de la Merced ("Mosquito of Mercy"), a name which has since been given another luchador. Domínguez is currently a four–time champion in three different promotions, holding the AAA World Trios Championship in Asistencia Asesoría y Administración (AAA), the Perros del Mal Extremo Championship and Mexican National Heavyweight Championship in Perros del Mal Producciones and the IWL Tag Team Championship in International Wrestling League. He is one of the main members of Los Perros del Mal.