Lance Armstrong, at a race in Australia in January.
Mark Gunter/AFP/Getty Images
May 20, 2011 The cycling legend has used the Web, and in particular his Twitter page, to hit back hard against the latest allegation that he used a performance-enhancing drug when he was competing. And he's raised questions about his accuser's credibility.
July 25, 2010: Alberto Contador of Spain flashes three fingers for his third Tour de France victory.
February 15, 2011 Spain's cycling federation says he can race again. The sport's international governing body, though, can appeal that decision. Contador, 28, has won the Tour de France three times.
October 9, 2007 Why do athletes feel they must dope?
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