Dani Fischer wins the women's race at the XSport Fitness Rock 'n' Roll Chicago Half Marathon presented by HumanaVitality.
The two Boulderites should contend for the win on Sunday.
Americans Tyler McCandless, Fernando Cabada, Stephanie Rothstein Bruce and Maegan Krifchin amongst top entrants.
30-year-old American is in the midst of a comeback, and he hopes his hard work pays off in Boston.
We caught up with the surprise second American finisher at last Sunday's Houston Marathon.
There's plenty to be excited about this year as the depth of U.S. distance running is on the rise.
A huge bonus is up for grabs in the half marathon.
Peter Magill, 51 years old, runs 1:10:19 to finish fourth overall at Rock 'n' Roll L.A.
The 30-year-old from Fresno headlines this weekend's Rock 'n' Roll Los Angeles Half Marathon.
American Fernando Cabada took second.