LONDON — Britain's Dwain Chambers waited 12 years to get back to the Olympics. It could end up being a triumphant return.

Chambers, whose lifetime ban as a doping offender was overturned in May, won his 100-meter heat in 10.02 seconds Saturday. He advanced to Sunday's semifinals, along with favorites Usain Bolt, Asafa Powell, Tyson Gay and Justin Gatlin.

The London-born Chambers finished fourth in the 100 at the 2000 Sydney Games. But he was banned from competing for two years after testing positive for designer steroid tetrahydrogestrinone in 2003. The British Olympic authority banned him for life.

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The Court of Arbitration for Sport ruled the BOA's lifetime ban was not in compliance with the World Anti-Doping Agency code, declaring Chambers had served his ban and clearing the way for his return.

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