Último Guerrero
In 2003 L.A. ParK began working for CMLL, although he was often kept off their television broadcasts due to the ongoing legal battles with Peña and AAA. In January 2004 L.A. Park teamed up with Shocker to defeat "Los Guerreros del Infierno" (Último Guerrero and Rey Bucanero) to win the CMLL World Tag Team Championship. Guerrero and Bucanero regained the titles 56 days later, after which L.A. Park challenged Último Guerrero to defend the CMLL World Light Heavyweight Championship against him at CMLL's 71st Anniversary Show, a match which L.A. Park lost two falls to one.