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Armstrong declines to defend himself in doping case

American Lance Armstrong with team RadioShack rides in a breakaway during stage 16 of the Tour de France on July 20, 2010 in Pau, France. Armstrong started the ride between Bagneres-de-Luchon and Pau in 31st place. French rider Pierrick Fedrigo won the stage while Alberto Contador retained the yellow jersey. The iconic bicycle race will include a total of 20 stages and will cover 3,642km before concluding in Paris on July 25. (Photo by Spencer Platt/Getty Images)
Seven-time Tour de France winner Lance Armstrong faced a deadline Thursday, August 23, to formally challenge sweeping doping allegations from the U.S. Anti-Doping Agency or accept sanctions that could include a lifetime ban from the sport and potentially strip him of his titles. In this photo, Armstrong with team RadioShack rides in a breakaway during stage 16 of the Tour de France on July 20, 2010 in Pau, France. (Photo by Spencer Platt/Getty Images)
FILE: Doping Charges Brought Against Lance Armstrong
Lance Armstrong, cyclist and founder and chairman of LIVESTRONG, looks on during the annual Clinton Global Initiative (CGI) September 22, 2010 in New York City. (Photo by Mario Tama/Getty Images) (Getty Images)

Seven-time Tour de France winner Lance Armstrong decided not to formally challenge sweeping doping allegations from the U.S. Anti-Doping Agency.