China's hurdler Liu Xiang attends a news conference at Shanghai Stadium September 18, 2009. Liu will return to competition for the first time since hobbling out of the Beijing Olympics at next weekend's Shanghai Golden Grand Prix.

China's hurdler Liu Xiang attends a news conference at Shanghai Stadium September 18, 2009. Liu will return to competition for the first time since hobbling out of the Beijing Olympics at next weekend's Shanghai Golden Grand Prix.

Job seekers queue to enter a job fair at Shanghai Stadium March 7, 2009.

Job seekers queue to enter a job fair at Shanghai Stadium March 7, 2009.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang (2L) of China and Terrence Trammell (2R) of the United States compete in the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China competes in the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China competes in the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang (2L) of China and Terrence Trammell (2R) of the United States compete in the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China poses for photos with the trophy for the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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China's Liu Xiang, left, and Terrence Trammell of US competes on the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international field and track event at the Shanghai Stadium in Shanghai, China, Sunday, Sept. 20, 2009.

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China's Liu Xiang, center, waves as he is surrounded by photographers after he won the Men's 110m Hurdles at the 2009 Shanghai Golden Grand Prix, an international track and field event at the Shanghai Stadium in Shanghai, China, Sunday, Sept. 20, 2009.

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Terrence Trammell of the United States, right, and Liu Xiang of China, left, right, their 110 meter hurdles men race during at 2009 Shanghai Golden Grand Prix, an international field and track event, Sunday Sept. 20, 2009 at Shanghai Stadium in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China competes in the men's 110m hurdles during the Shanghai Golden Grand Prix 2009 at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China answers media question after the men's 110m hurdles during the Shanghai Golden Grand Prix 2009 at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China competes in the men's 110m hurdles during the Shanghai Golden Grand Prix 2009 at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Fans hail Liu Xiang of China as he competes in the men's 110m hurdles during the Shanghai Golden Grand Prix 2009 at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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Athletes from right, Asafa Powell, Tyson Gay and Darvis Patton of US competes in the Men's 100m event at the 2009 Shanghai Golden Grand Prix, an international track and field event at the Shanghai Stadium in Shanghai, China, Sunday, Sept. 20, 2009.

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Tyson Gay of the US competes with his countryman Darvis Patton in the Men's 100m at the 2009 Shanghai Golden Grand Prix, an international field and track event at the Shanghai Stadium in Shanghai, China, Sunday, Sept. 20, 2009.

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Terrence Trammell of the United States squats down on the track just before his 110 meter hurdles men race during at 2009 Shanghai Golden Grand Prix, an international field and track event, Sunday Sept. 20, 2009 at Shanghai Stadium in Shanghai, China.

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Tyson Gay of US reacts after he won the Men's 100m at the 2009 Shanghai Golden Grand Prix, an international track and field event at the Shanghai Stadium in Shanghai, China, Sunday, Sept. 20, 2009.

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SHANGHAI, CHINA - SEPTEMBER 20: Liu Xiang of China competes in the men's 100m hurdles during the Shanghai Golden Grand Prix 2009 at Shanghai Stadium on September 20, 2009 in Shanghai, China.

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SHANGHAI, CHINA - SEPTEMBER 20: Terrence Trammell (R) of the United States and Liu Xiang of China compete during the men's 110m Hurdles during the 2009 Shanghai Golden Grand Prix at Shanghai Stadium on September 20, 2009 in Shanghai, China.

AP Photo 2 months ago

Tyson Gay of the United States, right, reacts as he crosses the finish line as his compatriot Darvis Patton, left, follows after their 100 meter men race during at 2009 Shanghai Golden Grand Prix, an international field and track event, Sunday Sept. 20, 2009 at Shanghai Stadium in Shang...

AP Photo 2 months ago

Tyson Gay of the United States, left, and Asafa Powell of Jamaica, right, during their 100 meter race at the 2009 Shanghai Golden Grand Prix, an international track and field event, Sunday Sept. 20, 2009 at Shanghai Stadium in Shanghai, China.

AP Photo 2 months ago

Tyson Gay of the United States, center, gestures as Nesta Carter of Jamaica, left, Darvis Patton of the United States, 2nd from left, Asafa Powell of Jamaica, 2nd from right and Marc Burns of Trinidad and Tobago, right get ready to start just before their 100 meter men race during at 2...