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FILE - In this June 30, 2019, file photo, United States' Christian Coleman wins the men's 100-meter race at the Prefontaine Classic IAAF Diamond League athletics meet in Stanford, Calif. Olympic gold-medal sprint contender Christian Coleman could be subject to an anti-doping sanction for mis…

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Sprinter Christian Coleman faces a Sept. 4 hearing at which he'll try to avoid a doping suspension after allegations he failed to provide authorities with his whereabouts so he can be tested for performance enhancers.

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FILE - In this Sept. 9, 2018, file photo, Novak Djokovic, of Serbia, returns a shot to Juan Martin del Potro, of Argentina, during the men's final of the U.S. Open tennis tournament in New York. Djokovic is seeded No. 1 for the U.S. Open, which he won last year for the third time.