Men's 4x400 Metres Relay Heats at 2012 Olympics in London

America's Bryshon Nellum and Bahama's Chris Brown run the fourth leg of the Men's 4x400 Metres Relay Heats on the seventh day of the Athletics in the Olympics stadium at the London 2012 Summer Olympics on August 9, 2012 in London. UPI/Hugo Philpott