Last-minute scrambling led to the mistake, which many runners complained about after the race.
The event's Corporate Cup Challenge winners were honored at the Denver Athletic Club.
Over 2,000 runners are expected to compete.
View more images from the 2010 Rock 'n' Roll Denver Marathon & 1/2 Marathon in the gallery below.
The Rock 'n' Roll Denver Marathon turned the Mile-High City into one big running party on October 17. Were you there?
Check out these great shots from along the course of Sunday's 2010 Rock 'n' Roll Denver Marathon & 1/2 Marathon.