LONDON (AP) _ World record-holder Khalid Khannouchi has withdrawn from the London Marathon in April to concentrate on the World Championships four months later.

Khannouchi, who set the record of 2 hours, 5 minutes, 42 seconds, at Chicago in 1999, planned to include the April 22 London race as part of his preparation for the worlds.

London Marathon organizers said Khannouchi and his wife and coach, Sandra Khannouchi, believe it is best for him to concentrate on the championships at Edmonton in August.

Despite the absence of the Moroccan-born Khannouchi, who obtained U.S. citizenship last year, London boasts a strong field. Entries include two-time world champion Abel Anton of Spain, half-marathon world record-holder Paul Tergat of Kenya, three-time London Marathon winner Antonio Pinto of Portugal and New York City Marathon champion Abdelkader El Mouaziz of Morocco.