Floyd Landis, who has accused former teammate and seven-time Tour de France winner Lance Armstrong of doping while riding for the U.S. Postal Service team, has filed a federal whistle-blower lawsuit against Armstrong and team officials that is separate from an ongoing federal criminal investigation.

Landis, contacted by ESPN.com, would not confirm or deny his role in the case, but another source with direct knowledge of the case said he was the sole plaintiff.

The 34-year-old ...

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