(Reuters) - American world indoor sprint favorite Ivory Williams has withdrawn from this weekend's IAAF championships because of a positive test for marijuana, his manager said on Wednesday.

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"He had a marijuana positive," Ray Flynn told Reuters in a telephone call from the United States.

"To the best of my knowledge it was at the U.S. championships," Flynn added.

With the positive, Williams was disqualified from his 60 meters victory at the American championships and became ineligible for the world championships, which start in Doha on Friday.