EUGENE, OR - MAY 29: Mo Farah of Great Britain leads the pack during the 10,000m during Day 1 of the IAAF Diamond League Prefontaine Classic at Hayward Field on May 29, 2015 in Eugene, Oregon. (Photo by Jonathan Ferrey/Getty Images)
EUGENE, OR - MAY 29: Mo Farah of Great Britain leads the pack during the 10,000m during Day 1 of the IAAF Diamond League Prefontaine Classic at Hayward Field on May 29, 2015 in Eugene, Oregon. (Photo by Jonathan Ferrey/Getty Images)