American cyclist Chris Horner celebrates winning Spain's Vuelta bicycle race Sunday. Anti-doping officials say that Horner, who at 41 is the oldest ever to win one of cycling's top events, was not at the hotel drug testers visited. Jaime Reina/AFP/Getty Images hide caption

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There were no positive doping tests during the 2013 Tour de France, officials say. Here, Chris Froome, the overall winner, steps into the anti-doping control bus after a stage in the race. Pascal Guyot /AFP/Getty Images hide caption

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Despite already being in the Hall of Fame, New York Yankees legend Mickey Mantle was banned from baseball in 1983, for his work for a casino. He was reinstated in 1985. MLB suspended Yankees third baseman Alex Rodriguez for 211 regular season games Monday. AP hide caption

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The 2013 Tour de France is breaking with several traditions, as it starts with a sprint stage on Corsica Saturday. Here, American Tejay van Garderen, 24, second from left, trains with his team on the island. Laurent Cipriani/AP hide caption

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In a lawsuit filed against Lance Armstrong on Tuesday, the Justice Department said the disgraced Tour de France winner "unjustly enriched" himself through his contract with the U.S. Postal Service. Reed Saxon/AP hide caption

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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 2010. Timothy A. Clary /AFP/Getty Images hide caption

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Former cyclist Scott Mercier has gained notoriety for refusing to go on a doping program 15 years ago. Here, Mercier (in blue jersey) rides just ahead of cyclist Chris Horner in 1997. Jed Jacobsohn/Getty Images hide caption

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Lance Armstrong competes in the Ironman Panama 70.3. triathlon in Panama City, Panama. Arnulfo Franco/AP hide caption

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Lance Armstrong, wearing the yellow jersey that identifies the leader in the Tour de France, during the race in 2003. He won that year and six other times. Joel Saget /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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LaShawn Merritt crosses the finish line first, in the men's 4x400-meter relay at the IAAF World Athletics Championships in Daegu, South Korea, Sept. 2. Once banned for doping, Merritt has been cleared to run in London next summer.

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