Matt Dunham/AP
Ukraine's Hanna Melnychenko competes in the women's javelin throw qualification at the World Athletics Championships at the Luzhniki stadium in Moscow, Russia, Aug. 13, 2013.
Ivan Sekretarev/AP
Russia's Elena Lashmanova, right, and Russia's Anisya Kirdyapkina compete in the women's 20-kilometer race walk final, Aug. 13, 2013.
Matt Dunham/AP
Mexico's Luis Rivera competes in the men's long jump qualification, Aug. 14, 2013.
Matt Dunham/AP
Britain's Sophie Hitchon competes in the women's hammer throw qualification, Aug. 14, 2013.
Martin Meissner/AP
Athletes exchange the baton during a handover as they compete in the men's 4x400-meter relay heat, Aug. 15, 2013.
David J. Phillip/AP
Turkey's Fatih Avan competes in the men's javelin throw qualification, Aug. 15, 2013.
Martin Meissner/AP
Russia's Yelena Isinbayeva celebrate winning gold in the women's pole vault final, Aug. 13, 2013.
Misha Japaridze/AP
Ukraine supporters cheer at the World Athletics Championships, Aug. 13, 2013.
David J. Phillip/AP
France's Salim Sdiri competes in the men's long jump qualification, Aug. 14, 2013.
Martin Meissner/AP
The United States' Inika Mcpherson competes in a women's high jump qualification, Aug. 15, 2013.
Martin Meissner/AP
Athletes compete in a women's 5,000-meter heat, Aug. 14, 2013.
Ivan Sekretarev/AP
New Zealand's Quentin Rew cools down as he competes in the men's 50-kilometer race walk, Aug. 14, 2013.
Ivan Sekretarev/AP
Jamaica's Shelly-Ann Fraser-Pryce reacts as she wins the women's 100-meter final, Aug. 12, 2013.
Anja Niedringhaus/AP
Romania's Elena Mirela Lavric lies on the track after a women's 800-meter heat, Aug. 15, 2013.
David J. Phillip/AP
Germany's David Storl competes in the men's shot put qualification, Aug. 15, 2013.
Matt Dunham/AP
China's Li Jinzhe competes in the men's long jump qualification, Aug. 14, 2013.
David J. Phillip/AP
South Africa's Godfrey Khotso Mokoena competes in the men's long jump qualification, Aug. 14, 2013.
David J. Phillip/AP
Athletes compete in the women's 3000-meter steeplechase final, Aug. 13, 2013.
Matt Dunham/AP
Ukraine's Hanna Melnychenko competes in the women's triple jump qualification, Aug. 13, 2013.
David J. Phillip/AP
Greece's Niki Panetta competes in the women's triple jump qualification, Aug. 13, 2013.
Martin Meissner/AP
Athletes compete in a women's 5000-meter heat, Aug. 14, 2013.
David J. Phillip/AP
Russia's Yelena Isinbayeva waves the national flag as she celebrates winning the gold medal in the women's pole vault final, Aug. 13, 2013.
Ivan Sekretarev/AP
Italy's Jean-Jacques Nkouloukidi cools off as he competes in the men's 50 kilometer race walk, Aug. 14, 2013.
Matt Dunham/AP
Israel's Hanna Knyazyeva-Minenko competes in the women's triple jump qualification, Aug. 13, 2013.
Misha Japaridze/AP
Czech Republic's Jirina Ptacnikova-Svobodova lands after an attempt in the women's pole vault final, Aug. 13, 2013.
David J. Phillip/AP
Jamaica's Shelly-Ann Fraser-Pryce poses for photographers with her national flag as she celebrates after winning gold in the women's 100-meter final, Aug. 12, 2013.
Martin Meissner/AP
Jamaica's Shelly-Ann Fraser-Pryce, second from left, looks at the timing board after winning the women's 100-meter final ahead of USA's Carmelita Jeter, left, USA's English Gardner, right, and USA's Alexandria Anderson, Aug. 12, 2013.
David J. Phillip/AP
New Zealand's Valerie Adams competes in the women's shot put final, Aug. 12, 2013.
Ivan Sekretarev/AP
Jamaica's Shelly-Ann Fraser-Pryce competes in a women's 200-meter heat at the World Athletics Championships, Aug. 15, 2013.
David J. Phillip/AP
The United States' Brad Walker competes in the men's pole vault final, Aug. 12, 2013.
Misha Japaridze/AP
Russia's Yelena Isinbayeva competes in the the women's pole vault final, Aug. 13, 2013.
David J. Phillip/AP
France's Salim Sdiri competes in the men's long jump qualification, Aug. 14, 2013.
Matt Dunham/AP
Kenya's Milcah Chemos Cheywa, center, competes to win the gold medal in the women's 3000-meter steeplechase final, Aug. 13, 2013.
Matt Dunham/AP
Germany's Kathrin Klaas competes in the women's hammer throw qualification, Aug. 14, 2013.