Britain's Dwain Chambers competes in the men's 100m heats at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / ERIC FEFERBERG
El jamaicano Johan Blake se impone con autoridad en su serie
Jamaica's Johan Blake competes in the men's 100m heats at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / ERIC FEFERBERG