London made his debut in WWE in late 2003. In 2004 he began teaming with fellow cruiserweight Billy Kidman and they eventually went on to win the WWE Tag Team Championship. After Kidman retired from active competition, London formed a tag team with Brian Kendrick, with whom he won the WWE Tag Team Championship. After their split, London began competing in the cruiserweight division and won the WWE Cruiserweight Championship. In late 2006, Kendrick returned and the two reformed as a team. London and Kendrick were managed by Ashley Massaro. London and Kendrick won the WWE Tag Team Championship, becoming the longest reigning WWE Tag Team Champions since the title's creation and the World Tag Team Championship. The team split when Kendrick was drafted to the SmackDown brand in June 2008 and London was released later that year. In 2009, he returned to the independent circuit, competing for Pro Wrestling Guerrilla, where he was one half of the former PWG World Tag Team Champions with partner El Generico under the team name ¡Peligro Abejas!.