Morgan Uceny of the U.S. falls down on the track during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. falls down on the track during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. falls to the ground behind Kenya's Hellen Onsando Obiri (2nd L) and Ethiopia's Abeba Aregawi in the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. falls down behind Kenya's Hellen Onsando Obiri in the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. is helped off the track by a medic after falling during the women's 1500m final
during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. kneels on the track after falling during the women's 1500m final as first placed Asli Cakir Alptekin of Turkey (C) hugs second placed compatriot Gamze Bulut during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. falls during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. kneels on the track after falling during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. kneels on the track after falling during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. reacts after falling during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. reacts after falling during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. reacts after failing to finish the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. falls during the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. kneels on the track after falling during the women's 1500m final as first placed Asli Cakir Alptekin of Turkey (C) hugs second placed compatriot Gamze Bulut during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. reacts after failing to finish the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. reacts after failing to finish the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)

Morgan Uceny of the U.S. reacts after failing to finish the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Morgan Uceny of the U.S. reacts after failing to finish the women's 1500m final during the London 2012 Olympic Games at the Olympic Stadium August 10, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)

Russia's Ekaterina Kostetskaya (L) looks at Morgan Uceny (C) of the U.S. standing next to Bahrain's Mimi Belete after their women's 1500m semi-final during the London 2012 Olympic Games at the Olympic Stadium August 8, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny of the U.S. reacts after her women's 1500m semi-final during the London 2012 Olympic Games at the Olympic Stadium August 8, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny reacts after the women's 1500m final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny reacts at the finish of the women's 1500m final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny celebrates as she crosses the finish line to win the women's 1,500 meters final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny reacts after the women's 1500m final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny (R) celebrates with Jenny Simpson after they came first and third respectively in the women's 1,500 meters final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny celebrates as she crosses the finish line to win the women's 1,500 meters final at the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

U.S. runner Morgan Uceny reacts as she crosses the finish line to win the women's 1500 meters race during the U.S. Olympic athletics trials in Eugene, Oregon July 1, 2012. REUTERS/Robert Galbraith (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny (R) and Jenny Simpson finish the women's 1500m semi-finals at the U.S. Olympic athletics trials in Eugene, Oregon June 29, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny (R) and Jenny Simpson finish their women's 1500m semi-finals at the U.S. Olympic athletics trials in Eugene, Oregon June 29, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny competes in the women's 1,500 meters qualifying at the U.S. Olympic athletics trials in Eugene, Oregon June 28, 2012. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny (2nd R) runs in the women's 1500 meters qualifying at the U.S. Olympic athletics trials in Eugene, Oregon, June 28, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny runs in the women's 1500 meters qualifying at the U.S. Olympic athletics trials in Eugene, Oregon June 28, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT ATHLETICS OLYMPICS)

Morgan Uceny of the U.S. celebrates after winning the women's 1500 metres event at the Memorial Van Damme, IAAF Diamond League athletics meeting in Brussels September 16, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: SPORT ATHLETICS)

Morgan Uceny of the U.S. crosses the finish line to win the women's 1500 metres event at the Memorial Van Damme, IAAF Diamond League athletics meeting in Brussels September 16, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: SPORT ATHLETICS)

(L to R) Maryam Yusuf Jamal of Bahrain, Tugba Karakaya of Turkey, Morgan Uceny of the U.S. Hellen Onsando Obiri of Kenya and Kalkidan Gezahegne of Ethiopia compete during the semifinal of women's 1,500 metres event at the IAAF World Championships in Daegu August 30, 2011. REUTERS/Michael Dalder (SOUTH KOREA - Tags: SPORT ATHLETICS)

Maryam Yusuf Jamal (C) of Bahrain leads Morgan Uceny (L) of the U.S. and Nuria Fernandez (R) of Spain to the finish line during the women's 1,500 metres heats at the IAAF World Championships in Daegu August 28, 2011. REUTERS/Michael Dalder (SOUTH KOREA - Tags: SPORT ATHLETICS)

Pole vaulter Jennifer Suhr of the U.S. (L), heptathlete Jessica Ennis of Great Britain (C) and 1500 metres runner Morgan Uceny of the U.S. (R) pose together after a news conference at the IAAF 2011 World Championships in Daegu, August 26, 2011. REUTERS/Mark Blinch (SOUTH KOREA - Tags: SPORT ATHLETICS)

Morgan Uceny from the U.S. (R) runs to win the women's 1500 metres during the Lausanne Diamond League (Athletissima) athletics meeting at the Stade de la Pontaise in Lausanne June 30, 2011. REUTERS/Pascal Lauener (SWITZERLAND - Tags: SPORT ATHLETICS)

Morgan Uceny from the U.S. (R) runs to win the women's 1500 metres during the Lausanne Diamond League (Athletissima) athletics meeting at the Stade de la Pontaise in Lausanne June 30, 2011. REUTERS/Ruben Sprich (SWITZERLAND - Tags: SPORT ATHLETICS)

Morgan Uceny from the U.S. (R) runs to win the women's 1500 metres during the Lausanne Diamond League (Athletissima) athletics meeting at the Stade de la Pontaise in Lausanne June 30, 2011. REUTERS/Ruben Sprich (SWITZERLAND - Tags: SPORT ATHLETICS)

Morgan Uceny wins the women's 1500 meter run at the U.S. Outdoor Track and Field Championships in Eugene, Oregon June 25, 2011. REUTERS/Steve Dipaola (UNITED STATES - Tags: SPORT ATHLETICS)