London Olympics Athletics Men

Jamaica's Usain Bolt crosses the finish line during his semifinal in the 100 meters. (David J. Phillip/Associated Press)

Jamaica’s Usain Bolt crosses the finish line during his semifinal in the 100 meters. (David J. Phillip/Associated Press)

Jamaica’s Usain Bolt crosses the finish line in a men’s 100-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/David J. Phillip)