148073313 Jamaica's Shelly-Ann Fraser-Pryce reacts after competing in the women's 100m heats at the athletics event during the London 2012 Olympic Games on August 3, 2012 in London. AFP PHOTO / GABRIEL BOUYS
Olympics Day 8 - Athletics LONDON, ENGLAND - AUGUST 04: (L-R) Tianna Madison of the United States, Allyson Felix of the United States, Shelly-Ann Fraser-Pryce of Jamaica, Blessing Okagbare of Nigeria, Carmelita Jeter of the United States, Veronica Campbell-Brown of Jamaica, Murielle Ahoure of Cote d'Ivoire and Kelly-Ann Baptiste of Trinidad and Tobago compete in the Women's 100m Final on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Jamie Squire/Getty Images)
Semoy Hackett of Trinidad and Tobago and Shelly-Ann Fraser-Pryce of Jamaica run over the Olympic rings in their women's 100m heat during the London 2012 Olympic Games at the Olympic Stadium Semoy Hackett (R) of Trinidad and Tobago and Shelly-Ann Fraser-Pryce of Jamaica run over the Olympic rings in their women's 100m heat during the London 2012 Olympic Games at the Olympic Stadium August 3, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)
From left, Bahamas' Debbie Ferguson-McKenzie, Ukraine's Olesya Povh, Jamaica's Shelly-Ann Fraser-Pryce, Trinidad's Semoy Hackett, and China's Wei Yongli compete in a women's 100-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 3, 2012. (AP Photo/Daniel Ochoa De Olza)
Carmelita Jeter of the U.S. runs ahead of Jamaica's Veronica Campbell-Brown to finish first in their women's 100m semi-finals at the London 2012 Olympic Games at the Olympic Stadium Carmelita Jeter of the U.S. (L) runs ahead of Jamaica's Veronica Campbell-Brown (2nd R) to finish first in their women's 100m semi-finals at the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. REUTERS/Phil Noble (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)
London 2012 - Leichtathletik Shelly-Ann Fraser-Pryce of Jamaica (R) competes in the 100m event during the London 2012 Olympic Games Athletics, Track and Field events at the Olympic Stadium, London, Britain, 04 August 2012. Photo: Michael Kappeler dpa +++(c) dpa - Bildfunk+++
Olympics Day 8 - Athletics LONDON, ENGLAND - AUGUST 04: Shelly-Ann Fraser-Pryce of Jamaica celebrates winning the gold in the Women's 100m Final on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Alexander Hassenstein/Getty Images)
148073345 PICTURE SHOWS THE SEMI-FINAL Jamaica's Shelly-Ann Fraser-Pryce (L) crosses the finish line next to Trinidad and Tobago's Kelly-Ann Baptiste after competing in the women's 100m semifinal at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / GABRIEL BOUYS
Ivory Coast's Murielle Ahoure smiles after finishing first in her women's 100m round 1 event at the London 2012 Olympic Games in the Olympic Stadium Ivory Coast's Murielle Ahoure smiles after finishing first in her women's 100m round 1 event at the London 2012 Olympic Games in the Olympic Stadium August 3, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)
Jamaica's Veronica Campbell-Brown celebrates third place in women's 100m final at London 2012 Olympic Games Jamaica's Veronica Campbell-Brown celebrates after finishing third the women's 100m final during the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. Jamaica's Shelly-Ann Fraser-Pryce finished first ahead of Carmelita Jeter of the U.S. who placed second and Campbell-Brown who came third. REUTERS/Mark Blinch (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)
148073345 PICTURE SHOWS THE SEMI-FINAL US' Carmelita Jeter waves after competing in the women's 100m semifinal at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / ERIC FEFERBERG
148073345 PICTURE SHOWS THE SEMIFINAL Nigeria's Blessing Okagbare celebrates after competing in the women's 100m semifinal at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / ERIC FEFERBERG
148073345 PICTURE SHOWS THE SEMI-FINAL US' Allyson Felix competes in the women's 100m semifinal at the athletics event of the London 2012 Olympic Games on August 4, 2012 in London. AFP PHOTO / OLIVIER MORIN
Tianna Madison of the U.S. reacts after her women's 100m semi-finals at the London 2012 Olympic Games at the Olympic Stadium Tianna Madison of the U.S. reacts after her women's 100m semi-finals at the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)