Chinese fans were upset but sympathetic.
"I think he may have wanted to win too much and could have caved under the pressure," said He Sheng, 27, who came from a southern province with just one Olympics ticket to see Liu.
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Liu's preparations for the Games were disrupted by a hamstring injury which forced him to withdraw from a meeting in New York on May 31 and he has not competed in public for more than two months.
Gold, patriotism spur on champs
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