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American 100-meter record-holder Tyson Gay will pull out of the world championships next month in Moscow after admitting to testing positive for a banned substance.
The U.S. Anti-Doping Agency informed Gay Friday that a sample from an out-of- competition test on May 16 came back positive. Gay did not reveal the substance.
The "B" sample will be tested soon.
The 30-year-old Gay won the 100- and 200-meters at nationals in June.
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