California’s fastest half-marathon lived up to its billing Sunday as American Meb Keflezighi set a new U.S. 20k record and bettered his personal best by 25 seconds winning the Rock ‘n’ Roll Half Marathon in a time of 1:01:00. Keflezighi’s 20k split of 57:52 broke Ryan Hall’s standing 20K record of 57:54 set in 2006.

California’s fastest half-marathon lived up to its billing Sunday as American Meb Keflezighi set a new U.S. 20k record and bettered his personal best by 25 seconds winning the Rock ‘n’ Roll Half Marathon in a time of 1:01:00. Keflezighi’s 20k split of 57:52 broke Ryan Hall’s standing 20K record of 57:54 set in 2006.