FILE - In a May 25, 2013, file photo Tyson Gay reacts after winning the Men's 100m during the IAAF Diamond League Grand Prix competition in New York. Gay was informed Friday July 12, 2013, he has tested positive for a banned substance and says he will pull out of the world championships next month in Moscow. (AP Photo/John Minchillo/file)
FILE - In a May 25, 2013, file photo Tyson Gay reacts after winning the Men's 100m during the IAAF Diamond League Grand Prix competition in New York. Gay was informed Friday July 12, 2013, he has tested positive for a banned substance and says he will pull out of the world championships next month in Moscow. (AP Photo/John Minchillo/file) ASSOCIATED PRESS
FILE - In a May 25, 2013, file photo Tyson Gay reacts after winning the Men's 100m during the IAAF Diamond League Grand Prix competition in New York. Gay was informed Friday July 12, 2013, he has tested positive for a banned substance and says he will pull out of the world championships next month in Moscow. (AP Photo/John Minchillo/file) ASSOCIATED PRESS

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