Sprinter Tyson Gay failed more than one drug test this year, recording one of his positives at the U.S. championships in June, where he won the 100 and 200 meters, The Associated Press learned on Friday. Since news of his positive, media reports have linked Gay to Clayton Gibson, an anti-aging doctor based in Atlanta. The 30-year-old, who won the world championship in the 100, 200 and 4x100 relay in 2007, took part in USADA's "My Victory" program — in which athletes volunteer for enhanced testing to prove they're clean — and his results never raised red flags. [...] that is, the out-of-competition test in May. [...] feeling healthy after years of nagging injuries, Gay was among those expected to push Usain Bolt at worlds next month, but instead of racing in Moscow, he'll be resolving his doping case.