1 of 21Morgan Uceny (2012)
Uceny's grimace is less about pain and more about misfortune. The two-time U.S. champion fell in the final lap of the 1,500-meter final after hitting the knee of Ethiopia's Abeba Aregawi. She had fallen in the final lap in last year's world championships in similar fashion, and sobbed on the London track well after the race.
Photo By: Terry Schmitt/UPI/Landov