The U.S. relay team has three injured runners . No . 1 Magomedrasul Medzhidov . A runner is carried off the track after being hit by a car during practice for the men's 4x100m relay. BMX racing has been crash-filled at London . U.S. women 's sprint relay teams are looking to make up for bad races in 2008 .
The U.S. relay team has three injured runners . A runner is carried off the track after being hit by a car during practice for the men's 4x100m relay. BMX racing has been crash-filled at London . U.S. women 's sprint relay teams are looking to make up for bad races in 2008 .