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Olympic champion Tyler Hamilton, once touted as the next great American cyclist and an heir to Lance Armstrong's throne atop the sport, ended his doping-tarnished career Friday by saying he tested positive for a banned substance and would retire.
Germany's Sabine Spitz has won the gold medal in the Olympic women's mountain bike race, adding it to the bronze she won at the Athens Games four years ago.
Greek sprinter Katerina Thanou was barred from the Beijing Olympics on Sunday for her role in a drug-testing scandal at the Athens Games four years ago.
The last time the world looked at Amanda Beard she was winning her first individual Olympic gold medal at the Athens Games.
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