Erica Bougard of the U.S. competes in the women's heptathlon javelin throw event during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.KAI PFAFFENBACH/Reuters
Ukraine's Hanna Melnychenko reacts during the javelin throw in the heptathlon at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.Matt Dunham/The Associated Press
Mexico's Monica Equihua competes in a women's 20 kilometer race walk final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.Ivan Sekretarev/The Associated Press
The track is reflected in Britain's Mo Farah's sunglasses before a men's 5000-meter heat at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.Matt Dunham/The Associated Press
Greece's Niki Panetta competes in the women's triple jump qualification at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.David J. Phillip/The Associated Press
Ekaterina Koneva of Russia competes in the triple jump qualification during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DOMINIC EBENBICHLER/Reuters
Italy's Elisa Rigaudo cools down during the women's 20 kilometer race walk final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.Ivan Sekretarev/The Associated Press
Mexico's Edgar Rivera competes in the men's high jump qualification at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.David J. Phillip/The Associated Press
Kabelo Kgosiemang of Botswana competes in the men's high jump qualifying round during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DENIS BALIBOUSE/Reuters
Anna Jagaciak of Poland competes in the women's triple jump qualifying round during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.FABRIZIO BENSCH/Reuters
Mo Farah of Britain (L) runs in his men's 5,000 metres heat during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.KAI PFAFFENBACH/Reuters
Donald Thomas of Bahamas competes in the men's high jump qualifying round during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.FABRIZIO BENSCH/Reuters
Netherlands' Dafne Schippers competes in the long jump in the heptathlon at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013.Matt Dunham/The Associated Press
Aleksandr Shustov of Russia competes in the men's high jump qualifying round during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DOMINIC EBENBICHLER/Reuters
Competitors run in their men's 5,000 metres heat during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DENIS BALIBOUSE/Reuters
Ida Marcussen of Norway competes in her women's heptathlon long jump event during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DOMINIC EBENBICHLER/Reuters
Piotr Malachowski of Poland competes in the men's discus throw final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.FABRIZIO BENSCH/Reuters
Gold medallist Pawel Fajdek of Poland poses during the victory ceremony for the men's hammer throw at the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.GRIGORY DUKOR/Reuters
Robert Harting of Germany competes in the men's discus throw final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DOMINIC EBENBICHLER/Reuters
Julian Wruck of Australia competes in the men's discus throw final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.KAI PFAFFENBACH/Reuters
Li Ling of China competes during the women's pole vault final at the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013.DENIS BALIBOUSE/Reuters
Brianne Theisen-Eaton of Canada celebrates her second place in the women's heptathlon event during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 13, 2013Reuters
Brianne Theisen-Eaton of Canada is embraced by her husband decathlon Olympic and world champion Ashton Eaton of the U.S. after the women's heptathlon 800 metres heat event of the IAAF World Athletics Championships at the Luzhniki Stadium in Moscow, August 13, 2013.Reuters