The 800m champion isn't afraid to speak his mind.
Mario Fraioli wraps up an exciting end to the first half of competition!
Men's and women's steeplechase and 5,000-meter prelims also got underway on Monday night.
Khadevis Robinson ribs champion Nick Symmonds about the "secrets" of his training program.
Ashton Eaton sets a decathlon world record on the second day of competition.
World-record holder David Rudisha is hoping for a fast 800m.
The American 800m champion thinks his sport is dying.
American Nick Symmonds was disappointed with his fifth-place showing.
He flew past Mo Farah in the final stretch.
Check out photos of a few fantastic finishes from last weekend's exciting action in Eugene.