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By JIM VERTUNO, AP Sports Writer – 1 hour ago  

AUSTIN, Texas (AP) — Lance Armstrong said Thursday night he is finished fighting a barrage of drug charges from the U.S. Anti-Doping Agency, putting his unprecedented string of seven Tour de France titles at risk along with his legacy as one of the greatest cyclists in history.

The decision sets up a likely lifetime ban from the sport and the possibility that Armstrong will be stripped of his signature achievement — the extraordinary run of Tour titles he won from 1999-2005.

Armstrong, who retired last year, declined to enter arbitration — his last option — because he said he was weary of fighting accusations that have dogged him for years. He has consistently pointed to the hundreds of drug tests that he has passed as proof of his innocence.