On March 10, 2005, London became the number one contender for Chavo Guerrero's WWE Cruiserweight Championship, which he later won in a cruiserweight battle royal. Guerrero challenged London for the title at Judgment Day, where London emerged victorious. During another title match with Guerrero on June 23, The Mexicools stormed the ring, attacking both London and Guerrero. On the July 14 episode of "SmackDown!", London teamed with Scotty 2 Hotty and Funaki to face The Mexicools. The ending of the match saw Juventud perform the 450° splash on London for the win, but landed his knee onto London's face and legitimately broke his nose in the process. London lost the Cruiserweight Championship on the August 6 episode of "Velocity" to Nunzio. Later in the night, London cut a heel promo encouraging the fans to protest his title loss. London went on a losing streak before returning as a face and teaming with the newly rehired Brian Kendrick.