It was a repeat victory for Mathew Kisorio and a redemption for Kim Smith.
Both athletes plan to qualify for the 2012 Olympics there.
He is searching for his fifth world title in the 10,000m.
The race's 34th edition is full of runners seeking Olympic-Trials-qualifying times.
Ethiopia's Aheza Kiros dominated the women's race.
The news was announced at his funeral last month.
The Salazar-coached training partners defeated a pair of Ethiopian runners.
The course is 21 kilometers of pure hill.
American Khadevis Robinson pulls off upset win in men's 800 meters.
Two former Boston Marathon champions are in the mix.