Shanghai

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Gold medalist Michael Tinsley of the United States, center, crosses the finishing line, followed by L.J. Van Zyl of South Africa, right, and Jehue Gordon of Trinidad during their 400m hurdles of the Diamond League Track and Field competition in Shanghai, China Sunday, May 18, 2014. (AP Photo/Ng Han Guan)

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Abeba Aregawi of Sweden crosses the finishing line at the 1,500m of the Diamond League Track and Field competition in Shanghai, China Sunday, May 18, 2014. (AP Photo/Ng Han Guan)

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Athletes from right, Justin Gatlin of the United States, Michael Rodgers of the United States and Nesta Carter of Jamaica cross the finishing line during their 100m of the Diamond League Track and Field competition in Shanghai, China Sunday, May 18, 2014. (AP Photo/Ng Han Guan)