Roger Clemens beat Brian McNamee to court, filing a defamation suit against the former trainer who claimed to have injected him with performance-enhancing drugs.

Clemens filed the suit last night in Harris County District Court in Texas, listing 15 alleged statements McNamee made to the baseball drug investigator George Mitchell. Clemens claimed the statement were “untrue and defamatory.”

“According to McNamee, he originally made his allegations to federal authorities after being threatened with criminal prosecution if he didn’t implicate Clemens,” according to the 14-page petition, obtained.

The suit, first reported by the Houston Chronicle, states that when McNamee told others that when he first was interviewed by federal law enforcement last June, he denied Clemens had used steroids or human growth hormone. The suit quotes McNamee as saying he was pressured by Assistant U.S. Attorney Matthew Parrella and Special Agent Jeff Novitzky of the IRS— key members of the BALCO prosecution — to implicate Clemens. The suit did not attribute where the quote from McNamee was obtained.

“After this exchange, and for the first time in his life, McNamee stated that he had injected Clemens with steroids in 1998, 2000, and 2001,” the suit said. “Following his recantation, McNamee has relayed that he magically went from a ‘target’ in a federal criminal drug investigation to a mere ‘witness,’ so long as he continued to ‘toe the line.'”

The suit said that when McNamee initially refused a request from federal authorities that he speak to Mitchell, he was threatened with prosecution. Clemens said McNamee decided only then to cooperate with Mitchell and the suit said McNamee told others the interview “was conducted like a Cold War-era interrogation in which a federal agent merely read to the Mitchell investigators McNamee’s previously obtained statement and then asked McNamee to confirm what he previously stated.”

Clemens asked that damages be determined by a jury.

“Clemens’ good reputation has been severely injured,” the suit said. “McNamee’s false allegations have also caused Clemens to suffer mental anguish, shame, public humiliation and embarrassment.”

McNamee’s lawyers are likely to remove the case to U.S. District Court in Houston, since Clemens and McNamee reside in different states. McNamee also could ask that the suit be moved to federal court in New York.

The seven-time Cy Young Award winner, who was scheduled to hold a late afternoon news conference today in Houston, sounded indignant and defiant in a segment of CBS’s “60 Minutes” broadcast last night, his first interview since McNamee accused him. The two are approaching a potential confrontation if they testify under oath at a January 16 hearing on Capitol Hill.

The most prominent player implicated in last month’s Mitchell Report, Clemens steadfastly maintained his innocence and called McNamee’s allegations “totally false.”

“If he’s doing that to me, I should have a third ear coming out of my forehead. I should be pulling tractors with my teeth,” Clemens said.