Oprah Winfrey talks to cyclist Lance Armstrong in Austin, Texas, on Monday. The first part of the interview airs Thursday night. George Burns/Courtesy of Harpo/AP hide caption

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Lance Armstrong, right, faces several court cases tied to evidence that he cheated. One of the suits was filed by his former U.S. Postal Service teammate Floyd Landis. Here, the pair ride during the 2003 Tour de France. Paolo Cocco/AFP/Getty Images hide caption

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Lance Armstrong, in the leader's yellow jersey, during the 2001 Tour de France. Patrick Kovarik /AFP/Getty Images hide caption

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Lance Armstrong grimaces prior to the start of the third stage of the Tour de France cycling race in Wanze, Belgium, on July 6, 2010. Armstrong said Thursday he is finished fighting charges from the U.S. Anti-Doping Agency that he used performance-enhancing drugs during his unprecedented cycling career. Christophe Ena/AP hide caption

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Defending Tour de France winner Alberto Contador is harangued by a man dressed in medical togs, during Contador's climb of the Alpe d'Huez. Lionel Bonaventure/AFP/Getty Images hide caption

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Andy Schleck climbs Galibier pass, where he won the 18th stage of the 2011 Tour de France. Thursday's 124.6-mile course ran between Pinerolo and Galibier Serre-Chevalier ski resort. Nathalie Magniez/AFP/Getty Images hide caption

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