United States' Manteo Mitchell competes in a 4x400-meter relay heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. Manteo had half a lap to go in the first leg of the 4x400-meter relay preliminaries Thursday and a choice to make: keep running or stop and lose the race. To him, it was never much of a choice. He finished the lap and limped to the side to watch the Americans finish the race and qualify easily for the final. A few hours later, doctors confirmed what he suspected: He had run the last 200 meters with a broken left fibula. (AP Photo/Martin Meissner)