Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. [Photo/Agencies]

Chinese President Xi Jinping applauds during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. [Photo/Agencies]

A flag bearer during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. [Photo/Agencies]

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. [Photo/Agencies]

Performers hold dolls of the official mascot during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. [Photo/Agencies]

Performers form the characters "2015 Beijing" during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. [Photo/Agencies]

Performers take part in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. [Photo/Agencies]

IAAF President Lamine Diack speaks during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. [Photo/Agencies]

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