Juan Francisco Domínguez (born 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 the Mercy"), a name which has since been given another luchador. He is best known for his stints with the Asistencia Asesoría y Administración (AAA) promotion, the latest while representing Los Perros del Mal.