(L-R) Vietnam's Truong Thanh Hang, US athlete Alice Schmidt, South Africa's Caster Semenya, India's Tintu Luka and Britain's Emma Jackson compete in their women's 800 metres heat at the International Association of Athletics Federations (IAAF) World Championships in Daegu on September 1, 2011. AFP PHOTO / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP via Getty Images)
