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United States' Shalane Flanagan competes in the women's 10000-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/David J. Phillip) ( Russia Athletics Worlds )

Darya Klishina of Russia competes in the Women's Long Jump final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175989950 )

United States' Brittney Reese waits on the podium for her gold medal during the medals ceremony for the women's long jump at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Alexander Zemlianichenko) ( Russia Athletics Worlds )

Athletes compete in the Men's 20km Race Walk final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Julian Finney/Getty Images) ( 175984645 )

Brazil's Franciela Krasucki, Ukraine's Nataliya Pohrebnyak and Jamaica's Shelly-Ann Fraser-Pryce start in a women's 100-meter heat at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/David J. Phillip) ( Russia Athletics Worlds )

Jordan Hasay of the United States competes in the Women's 10000 final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175992428 )

France's Floria Guei competes in the women's 400-meter semifinal at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Ivan Sekretarev) ( Russia Athletics Worlds )

Orlando Ortega of Cuba and Aries Merritt of the United States compete in the Men's 110 metres hurdles heats during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175966650 )

United States' Tia Brooks competes in the women's shot put qualification at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/David J. Phillip) ( Russia Athletics Worlds )

Russia's Darya Klishina competes on the women's long jump final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Matt Dunham) ( Russia Athletics Worlds )

Athletes compete in a women's 1500-meter heat at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Martin Meissner) ( Russia Athletics Worlds )

Gold medalist Ashton Eaton of United States celebrates after the Men's Decathlon 1500 metres during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Jamie Squire/Getty Images) ( 175992152 )

Blessing Okagbare of Nigeria celebrates a jump in the Women's Long Jump final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175989787 )

Damian Warner of Canada competes in the Men's Decathlon Pole Vault during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175982364 )

Brittney Reese of the United States competes in the Women's Long Jump final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175989816 )

Melina Robert-Michon of France celebrates an attepmt in the Women's Discus final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175992418 )

Usain Bolt of Jamaica and Mike Rodgers of the United States compete in the Men's 100 metres semi final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175987400 )

Jamaica's Usain Bolt celebrates after winning gold in the Men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Martin Meissner) ( Russia Athletics Worlds )

Gunnar Nixon of the U.S. competes in the men's decathlon discus throw event during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Fabrizio Bensch - Pool/Getty Images) ( 175973052 )

Winner Aleksandr Ivanov of Russia, right, embraces second placed Chen Ding of China, center, as Spain's Miguel Angel Lopez celebrates his third place after the men's 20 kilometer race walk at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Anja Niedringhaus) ( Russia Athletics Worlds )

Athletes lie on the track after the men's 20 kilometer race walk at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Anja Niedringhaus) ( Russia Athletics Worlds )

From top, Ignacio Morales of Cuba, Sergey Shubenkov of Russia, Artur Noga of Poland, Konstadinos Douvalidis of Greece, David Oliver of the United States, Andrew Riley of Jamaica, Rayzam Shah Wan Sofian of Malaysia, Jumrut Rittidech of Thailand and Greggmar Swift of Barbados compete in the Men's 110 metres hurdles heats during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Julian Finney/Getty Images) ( 175966640 )

Russia's Ilya Shkurenev celebrates after setting his personal best in the pole vault in the decathlon at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Matt Dunham) ( Russia Athletics Worlds )

Gunnar Nixon of the United States competes in the Men's Decathlon Javelin during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175984969 )

Arman Hall of the United States reacts in the Men's 400 metres heats during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175972278 )

Usain Bolt of Jamaica (C) crosses the line to win gold ahead of Kemar Bailey-Cole of Jamaica, Justin Gatlin of the United States and Nickel Ashmeade of Jamaica in the Men's 100 metres Final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Julian Finney/Getty Images) ( 176023682 )

Francena McCorory of the United States competes in the Women's 400 metres semi final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Mark Kolbe/Getty Images) ( 175989913 )

United States' Shalane Flanagan reacts after competing in the women's 10000-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Anja Niedringhaus) ( Russia Athletics Worlds )

Octavious Freeman of the United States and Verena Sailer of Germany compete in the Women's 100 metres heats during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175972622 )

Becky Holliday of the United States competes in the Women's Pole Vault qualification during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Jamie Squire/Getty Images) ( 175991745 )

Pascal Behrenbruch of Germany competes in the Men's Decathlon Discus during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Jamie Squire/Getty Images) ( 175976239 )

Yarelys Barrios of Cuba competes in the Women's Discus final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175992376 )

Lisa Ryzih of Germany competes in the Women's Pole Vault qualification during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175989396 )

China's Chen Ding, right, and Russia's Aleksandr Ivanov compete in the men's 20 kilometer race walk at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Misha Japaridze) ( Russia Athletics Worlds )

Croatia's Sandra Perkovic competes in the women's discus throw final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Matt Dunham) ( Russia Athletics Worlds )

(L-R) Aaron Brown of Canada and Usain Bolt of Jamaica leaves the blocks in the Men's 100 metres semi final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Mark Kolbe/Getty Images) ( 175987528 )

Russia's Evgeniia Kolodko competes in the women's shot put qualification at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/David J. Phillip) ( Russia Athletics Worlds )

Croatia's Sandra Perkovic celebrates her gold medal win in the women's discus throw at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Matt Dunham) ( Russia Athletics Worlds )

(L-R) Nick Symmonds of the United States and Ayanleh Souleiman of Djibouti compete in the Men's 800 metres semi final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175989369 )

Nadine Muller of Germany competes in the Women's Discus final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175989730 )

(L-R) Gold medalist Tirunesh Dibaba of Ethiopia and bronze medalist Belaynesh Oljira of Ethiopia celebrate after the Women's 10000 final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175992675 )

Athletes compete in the women's 10000-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Ivan Sekretarev) ( Russia Athletics Worlds )

Serbia's Ivana Spanovic competes in the women's long jump final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Matt Dunham) ( Russia Athletics Worlds )

Ding Chen of China celebrates winning silver in the Men's 20km Race Walk final during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175985165 )

Winner Ashton Eaton of the United States, right, is congratulated by second placed Pascal Behrenbruch following the men's 1500-meter decathlon at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Anja Niedringhaus) ( Russia Athletics Worlds )

Ivory Coast's Murielle Ahoure blows a kiss to television cameras before competing in a men's 100-meter heat at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Ivan Sekretarev) ( Russia Athletics Worlds )

USA's Justin Gatlin, right, poses for a photograph after winning silver in the Men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Ivan Sekretarev) ( Russia Athletics Worlds )

USA's Justin Gatlin celebrates winning silver in the Men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Martin Meissner) ( Russia Athletics Worlds )