China's national hero Liu Xiang said that he is unsure about the 2012 Olympic Games after suffering another defeat at home at the IAAF Diamond League here on Sunday.

The 2004 Athens Olympic champion and 2007 world titlist was beaten by American David Oliver and compatriot Shi Dongpeng in a much-anticipated race at the Shanghai Stadium.

Liu finished a disappointing third place in 13.40 seconds, behind the world indoor champion Oliver who won the race in a season best of 12.99 and Shi in 13.39.

Liu Xiang of China competes during the men's 110m hurdles at the IAAF Diamond League athletic meeting in Shanghai, east China, May 23, 2010. Liu ranked the third with 13.40 seconds.

Local fans have expected the former world record holder to regain world-class form after finishing seventh in his international return at the world indoor championships in March. He has been pinned on high hopes after the shock withdrawal from the Beijing Olympics in 2008 because of an Achilles tendon injury, which disappointed millions of Chinese fans.

Ryan Braithwaite of Barbados, the surprise winner in Berlin last year, continued his disappointing start to the season, clattering a succession of hurdles and failing to complete the race.

Liu started well but faded quickly. Oliver finished nearly five meters clear of second placed Shi as Liu completed the podium.

"I think it is a good run tonight," Liu said after the race. "I feel great even though I lost to my teammate Shi Dongpeng for the first time in my career. Shi registered a season best."

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