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Lance Armstrong faces losing his Olympic bronze medal after opting not to appeal against his doping punishment.
The Texan was banned for life and had his professional record from 1998 onwards erased in October when the International Cycling Union (UCI) ratified a United States Anti-Doping Agency (Usada) report that described him as a serial drugs cheat.
Armstrong had until December 27 to contest the decision, but he let the deadline pass without action.
He had already lost his seven Tour de France titles and could now have his third-place finish in the men's Olympic time trial in Sydney in 2000 scratched by the International Olympic Committee.
The 41-year-old continues to deny that he doped on the way to winning the Tour between 1999 and 2005, but announced in August that he would no longer fight charges made against him by Usada.
The agency later published a 1,000-page report that said Armstrong's US Postal Service team operated the "most sophisticated, professionalized and successful doping program that sport has ever seen".