Marathon runners (L-R) Uganda's Stephen Kiprotich, Kenya's Emmanuel Mutain, Ethiopia's Tsegaye Kebede, Kenya's Geoffrey Mutai, Ethiopia's Ibrahiim Jeilan and Ethiopia's Tsegaye Mekonnen pose for photographers near Tower Bridge in central London on April 9, 2014 during a photo call ahead of the London marathon. Britain's double Olympic and world champion Mo Farah makes his eagerly-awaited marathon debut in London on April 13, but has his work cut out with the jump-in distance and competition from top Kenyans and Ethiopians. AFP PHOTO/CARL COURT        (Photo credit should read CARL COURT/AFP/Getty Images)