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Performers carry flags of competing countries during the opening ceremony of the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. KIRILL KUDRYAVTSEV/AFP/Getty Images ( 521997072 )

MOSCOW, RUSSIA - AUGUST 10: Dancers perform during the open ceremony during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175932897 )

MOSCOW, RUSSIA - AUGUST 10: Dancers perform during the opening ceremony during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175935471 )

Performers take part in the opening ceremony of the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ALEXANDER NEMENOV/AFP/Getty Images ( 521996624 )

MOSCOW, RUSSIA - AUGUST 10: Dancers perform during the open ceremony during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175932877 )

Performers take part in the opening ceremony of the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ANTONIN THUILLIER/AFP/Getty Images ( 521996643 )

MOSCOW, RUSSIA - AUGUST 10: Russian President Vladimir Putin speaks during the opening ceremony during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175935299 )

MOSCOW, RUSSIA - AUGUST 10: Usain Bolt of Jamaica speaks to the media after competing in the Men's 100 metres heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175931245 )

MOSCOW, RUSSIA - AUGUST 10: Usain Bolt of Jamaica competes in the the Men's 100 metres heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images) ( 175931026 )

Participants compete during the men's 10,000 metres final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521993305 )

MOSCOW, RUSSIA - AUGUST 10: (L-R) Antoine Adams of Saint Kitts and Nevis, Shavez Hart of Bahamas and Akani Simbine of South Africa compete in the Men's 100 metres heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175932833 )

MOSCOW, RUSSIA - AUGUST 10: Athletes compete in the Men's 10000 metres final during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175921686 )

Athletes make their way through Red Square as they compete in the Women's Marathon during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on A (Photo by Mark Kolbe/Getty Images) ( 175915294 )

MOSCOW, RUSSIA - AUGUST 10: Mo Farah of Great Britain competes in the Men's 10000 metres final during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Mark Kolbe/Getty Images) ( 175925349 )

MOSCOW, RUSSIA - AUGUST 10: Mo Farah of Great Britain crosses the line to win gold in the Men's 10000 metres final during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Julian Finney/Getty Images) ( 175925390 )

Great Britain's Mohamed Farah (down) celebrates winning the men's 10,000 metres final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. YURI KADOBNOV/AFP/Getty Images ( 521993150 )

Gold medallist Great Britain's Mo Farah stands on the podium during the medal ceremony for the men's 10,000 metres at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ALEXANDER NEMENOV/AFP/Getty Images ( 521995866 )

MOSCOW, RUSSIA - AUGUST 10: Christine Ohuruogu of Great Britain competes in the Women's 400 metres heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175919075 )

MOSCOW, RUSSIA - AUGUST 10: Edna Ngeringwony Kiplagat of Kenya crosses the line to win gold in the Women's Marathon during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Paul Gilham/Getty Images) ( 175916057 )

Winner Kenya's Edna Ngeringwony Kiplagat (L) celebrates with second placed Italy's Valeria Straneo during the women's marathon final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. KIRILL KUDRYAVTSEV/AFP/Getty Images ( 521989747 )

MOSCOW, RUSSIA - AUGUST 10: Renaud Lavillenie of France competes in the Men's Pole Vault qualification during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Ian Walton/Getty Images) ( 175909287 )

MOSCOW, RUSSIA - AUGUST 10: Athletes compete in the Women's 3000 metres steeplechase heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Cameron Spencer/Getty Images) ( 175918719 )

Canada's Christabel Nettey competes during the women's long jump event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521996596 )

Germany's Sostene Moguenara competes in the women's long jump event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521996395 )

Canada's Aaron Brown (C) races during a men's 100 metres qualifier at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521995990 )

Germany's Sostene Moguenara jumps during the women's long jump event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521995139 )

Great Britain's Shara Proctor jumps during the women's long jump event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521994003 )

MOSCOW, RUSSIA - AUGUST 10: (L-R) Keston Bledman of Trinidad and Tobago, Dwain Chambers of Great Britain and Sam Effah of Canada compete in the Men's 100 metres heats during Day One of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 10, 2013 in Moscow, Russia. (Photo by Mark Kolbe/Getty Images) ( 175932809 )

Great Britain's Mohamed Farah (2L) runs during the men's 10,000 metres final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521993789 )

Ukraine's Natalia Semenova competes during the women's discus throw event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521993358 )

Czech Republic's Lukas Melich competes during the men's hammer throw event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521991582 )

Participants clear the water jump during the women's 3000 metres steeplechase event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. KIRILL KUDRYAVTSEV/AFP/Getty Images ( 521991658 )

Russia's Kseniya Ryzhova (R) competes during a women's 400 metres qualifying event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013 ALEXANDER NEMENOV/AFP/Getty Images ( 521991230 )

US Natasha Hastings runs during the women's 400 metres event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. OLIVIER MORIN/AFP/Getty Images ( 521991117 )

Participants clear the water course during the women's 3000 metres steeplechase event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521991096 )

Third placed Japan's Kayoko Fukushi celebrates at the finish line during the women's marathon final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. KIRILL KUDRYAVTSEV/AFP/Getty Images ( 521989633 )

Serbia's Mihail Dudas competes during the men's decathlon shot put event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521987939 )

A participant competes during the men's pole vault event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. FRANCK FIFE/AFP/Getty Images ( 521986658 )

France's Gael Querin competes during the men's decathlon long jump event at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 10, 2013. ADRIAN DENNIS/AFP/Getty Images ( 521986277 )