The 33-year-old has her eyes on Deena Kastor's 2:19:36 mark.
Over 20,000 entrants took to the streets of The Windy City on Sunday morning.
Shalane Flanagan and Andy Wacker won the 2014 Rock 'n' Roll Chicago Half Marathon.
Runners had the chance to meet America's best female marathoner before Rock 'n' Roll Chicago.
The 33-year-old is aiming for a sub-2:20 marathon clocking this fall.
America's top marathoner will lead the 5K on July 19 and race the half marathon on July 20.
There’s a reason Olympic runners have coaches—the same reason you may need one.
Shalane Flanagan finishes second, Sean Quigley places seventh to finish as top Americans.
It's been 29 years since an American woman finished first on Boylston Street.
We highlight some of the top achievements of Flanagan's career, which includes multiple national titles, national records and an Olympic