The promise of a spectacular World Championship showdown between the USA and Jamaica has dissolved in a spate of doping cases that leave the Moscow sprints looking more likely to be a showcase for Usain Bolt.
US athlete Tyson Gay (L) leads the pack ahead of Jamaica's Asafa Powell (R) in the 100m at the Diamond League Athletics meeting "Athletissima" on July, 4, 2013 in Lausanne. The promise of a spectacular World Championship showdown between the US and Jamaica has disolved in a spate of doping cases, involving Gay and Powell, that leave the sprints looking likely to be a showcase for Usain Bolt.
A resurgent Tyson Gay had sent a ripple of excitement through US athletics in winning the 100m at the US trials at Des Moines in 9.75sec.
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