SAN FRANCISCO(AP) -- Federal prosecutors at a doping trial in San Francisco are laying out a sad tale of athletes cheating.

Former track coach Trevor Graham is accused of lying to federal authorities in the investigation of a massive sports doping ring centered around BALCO, the Bay Area Laboratory Cooperative.

In the second day of what's expected to be a two-week trial, the names of several world class athletes felled by the scandal have surfaced, including Marion Jones, Tim Montgomery and Antonio Pettigrew.

Jurors heard yesterday from the lead federal investigator and from the government's star witness. Angel "Memo" Heredia admittedly sold performance enhancing drugs. He testified he worked through Graham.

Prosecutors say Graham told the investigator he had had only one innocent phone conversation with Heredia, and never met him or bought drugs from him.