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Casey played two holes in second round when he withdrew due to concerns that he might have reinjured himself. He has missed a good portion of the second half of the season due to a torn interior oblique muscle. He has also withdrawn from next week's UBS Hong Kong Open to return to the United States for an exam. "He's had pain before but he felt it severe enough to realise that it was something different," said his agent, Guy Kinnings. "We always agreed that if he felt that, he would stop. So I'm going to get him home tonight to see a specialist he's been working with." At this point, a start at the Dubai World Championship (November 19-22) seems doubtful. Depending on the doctor's report, it's possible that Casey won't return until the SBS Championship (January 7-10).