August 4, 2012 (21 images)

Justin Gatlin of the USA (R) salutes after crossing the finish line of round one of the Men's 100M in the Track and Field competition at the Olympic Stadium in the London 2012 Summer Olympics on August 4, 2012 in London. UPI/Terry Schmitt

South Africa's Oscar Pistorius leaves the blocks in Round One of the Men's 400 metres on the second day of the Athletics in the Olympics stadium at the London 2012 Summer Olympics on August 4, 2012 in London. UPI/Hugo Philpott

Shelly-Ann Fraser-Pryce of Jamaica (R) beats out Allyson Felix of the USA (C) and Tianna Madison in the Women's 100M at the London 2012 Summer Olympics on August 4, 2012 in London. UPI/Terry Schmitt

Shelly-Ann Fraser-Pryce of Jamaica wins the Women's 100M at the London 2012 Summer Olympics on August 4, 2012 in London. UPI/Terry Schmitt