The lineup for the October race includes reigning Boston Marathon champion Rita Jeptoo, along with American Amy Hastings.
She has never been beaten on the storied Hayward Field.
A huge bonus is up for grabs in the half marathon.
The Olympian will rejoin her college coach in Ames.
The Ethiopian closed with a blistering final lap, winning by over 5 seconds to cap off the first day of competition.
Check out these great shots from the first day of track action!
Check out these great shots from a rainy night in Eugene!
Mario Fraioli wraps up an exciting first day of action at the 2012 U.S. Olympic Track & Field Trials
Thrilling finish caps off an exciting first day of competition at the 2012 Olympic Track & Field Trials.
Bairu wins men's race at Dodge Latin Music Miami Beach Half Marathon.