The Synchrony Financial Rock 'n' Roll San Diego Marathon and 1/2 Marathon kicks off this weekend in America's Finest City. Twenty years ago, 20,000 runners from more than 30 countries and all 50 states took to the streets of San Diego for the first-ever Rock 'n' Roll race, an event that changed the face of running forever. This year, the series is celebrating its historic anniversary with fun, excitement and some of the fastest runners in the world.
28dSpecial from Runner's World
31dEric Gomez, ESPN.com
39dAndrew Oryada, KweséESPN
39dPhotography by Paula Bronstein