Athletes during the preliminary round of the women's 100m race at the 2013 IAAF World Championships in Moscow.

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Russia's Artyom Lukyanenko performs a pole vault during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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An athlete performs a pole vault during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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An athlete performs a pole vault during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Belgium's Thomas van der Plaetsen during the discus throw event of the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Artyom Lukyanenko competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Artyom Lukyanenko competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Artyom Lukyanenko competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Artyom Lukyanenko competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 100m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Jamaica's Javere Bell, left, and Grenada's Kirani James in the men's 400m preliminary race at the 2013 World Championships in Athletics in Moscow.

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An athlete in the men's 400m preliminary race at the 2013 World Championships in Athletics in Moscow.

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The United States' Ashton Eaton competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Sergei Sviridov competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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An athlete in the men's 400m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 1,500m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 1,500m preliminary race at the 2013 World Championships in Athletics in Moscow. Right: Russia's Svetlana Podosenova.

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Athletes in the women's 1,500m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Athletes in the women's 1,500m preliminary race at the 2013 World Championships in Athletics in Moscow.

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The United States' Ashton Eaton competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Yekaterina Sharmina in the women's 1,500m preliminary race at the 2013 World Championships in Athletics in Moscow.

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Russia's Ilya Shkurenyov competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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The United States' Ashton Eaton competes in the discus throw event during the men's decathlon at the 2013 World Championships in Athletics in Moscow.

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Russia's Sergei Shubenkov, center, during the preliminary round of the men's 110m hurdles at the 2013 IAAF World Championships in Moscow.

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Russia's Ilya Shkurenev, left, during the preliminary round of the men's 110m hurdles at the 2013 IAAF World Championships in Moscow.

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Ashton Eaton (United States of America), foreground, during the 110m hurdles of the men's decathlon at the 2013 IAAF World Championships in Moscow.

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Russia's Konstantin Shabanov, left, during the preliminary round of the men's 110m hurdles at the 2013 IAAF World Championships in Moscow.

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Russia's Artyom Lukyanenko, left, during the 110m hurdles of the men’s decathlon at the 2013 IAAF World Championships in Moscow.

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Athletes during the 110m hurdles of the men’s decathlon at the 2013 IAAF World Championships in Moscow.

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Russia's Ilya Shkurenev, right, during the 110m hurdles of the men’s decathlon at the 2013 IAAF World Championships in Moscow.

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Athletes during the 110m hurdles of the men’s decathlon at the 2013 IAAF World Championships in Moscow.

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Athletes during the 110m hurdles of the men’s decathlon at the 2013 IAAF World Championships in Moscow.

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