The 2015 Pittsburgh Marathon starts on Liberty Avenue. (Bob Donaldson/Post-Gazette)
Runners clog Liberty Avenue near Grant Street. (Steve Mellon/Post-Gazette)
The marathon has sold out each year since its return in 2009.
(Andrew Rush/Post-Gazette)
Elite runners leave the Strip District and head over the 16th Street Bridge. (Larry Roberts/Post-Gazette)
A crowd gathers on the Rachel Carson Bridge to cheer on the elite runners. (Steve Mellon/Post-Gazette)
Runners navigate their way through the Pittsburgh Marathon course. (Andrew Rush/Post-Gazette)
Crowd cheers runners as they cross the Andy Warhol Bridge. (Andrew Rush/Post-Gazette)
A flag-waving runner makes his way across the Andy Warhol Bridge. (Steve Mellon/Post-Gazette)
Lead runners in the half-marathon race through the North Side. (Larry Roberts/Post-Gazette)
A cow sighting on the North Side. (Steve Mellon/Post-Gazette)
Erica Liang and the band Working Breed entertained the runners as they turned off of Lincoln Avenue on the North Side. (Steve Mellon/Post-Gazette)
A marathon participant dressed as Captain America runs on Carson Street in the South Side during the 2015 Pittsburgh Marathon, on Sunday, May 3, 2015. (Michael Henninger/Post-Gazette)
Chad Nowak of the South Side watches from the roof of an apartment building on Carson Street. (Michael Henninger/Post-Gazette)
A hand cyclist rides down Carson Street at its intersection with 12th Street. (Michael Henninger/Post-Gazette)
A runner cools off at a water station on Carson Street on the South Side. (Michael Henninger/Post-Gazette)
Dave Meal of Wexford urges on runners on Carson Street in the South Side. (Michael Henninger/Post-Gazette)
The Pittsburgh Marathon is one of 20 largest marathons and half marathon events in the United States. (Bob Donaldson/Post-Gazette)
All wrapped, a runner makes his way down North Braddock Avenue in Homewood. (Nate Guidry/Post-Gazette)
Pittsburgh marathon volunteer Jo Ann Moore waves to runners as they make there way down Frankstown Avenue in Homewood. (Nate Guidry/Post-Gazette)
Volunteer Erica Motley cheers and hands water to runners as they make their way down Frankstown Avenue in Homewood. (Nate Guidry/Post-Gazette)
One runner juggles. (Bob Donaldson/Post-Gazette)
‘Big Fish’ John Hollenberger, of Pittsburgh, followed wife Jennifer to the finish line at the 2015 Pittsburgh Marathon. (Bob Donaldson/Post-Gazette)
Runners celebrate as they cross the finish line. (Steve Mellon/Post-Gazette)
Garrett Jeffries, from South Oakland, cools down after finishing. (Larry Roberts/Post-Gazette)
Clara Santucci is covered by the American flag after finishing the Pittsburgh Marathon. Santucci, who was the first female marathon winner last year, wins again. (Bob Donaldson/Post-Gazette)
Runner in distress at the end of the race. (Bob Donaldson/Post-Gazette)
