Norway's Ezinne Okparaebo (L), Kelly-Ann Baptiste of Trinidad and Tobago (2nd L), Allyson Felix of the U.S. (2nd R) and Jamaica's Shelly-Ann Fraser-Pryce race toward the finish line during the women's 100m semi-finals at the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. REUTERS/Pawel Kopczynski (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)