KAVARNA, BULGARIA - OCTOBER 06: Zersenay Tadese of Eritrea competes during the 20th IAAF Mens World Half Marathon on October 6, 2012 in Kavarna, Bulgaria. (Photo by Scott Heavey/Getty Images)
KAVARNA, BULGARIA - OCTOBER 06: Zersenay Tadese of Eritrea competes during the 20th IAAF Mens World Half Marathon on October 6, 2012 in Kavarna, Bulgaria. (Photo by Scott Heavey/Getty Images)