Kenyan women sweep top five positions; Kipsang's win leads men's team to silver medal.
World Half Marathon Championships will take place simultaneously with citizens race.
In 2013, 1,100 U.S. marathons generated a record 541,000 finishers.
Marc Davis' mark of 13:24 has stood since 1996.
Lauren Kleppin and Tyler Pennel will compete in Saturday’s World Half Marathon Championships in Copenhagen.
The 21-year-old professional triathlete carries a lot of inspiration into Sunday's Carlsbad 5000.
More than 77,000 marathon hopefuls applied for spots in the 2014 race.
The race will be broadcast live Sunday at carlsbad5000.com/live.
Planning and organizing a race is a much bigger challenge than it first seems, writes Daniel Seidel.
The coverage will honor those affected by the tragic events of April 15, 2013.