Roger Clemens's bullpen got a little emptier today after his former Yankee compatriot Andy Pettitte effectively came in for relief on the opposing team. In the morning, Newsdaybroke word that Pettitte has already backed up a crucial piece evidence linking Clemens to steroid use. According to Representative Tom Davis, Pettitte's account of a particular 2002 workout session with the two athletes and Clemens's trainer Brian McNamee corroborates the version that McNamee tells — that while the three were training six years ago, McNamee told Pettitte that he was giving Clemens illegal drugs. McNamee, of course, is the source of much of the Mitchell Report's evidence on steroid and HGH use in the MLB. He's insisted that he repeatedly injected Clemens with steroids and HGH, and Pettitte with HGH (which Pettitte has admitted to). If Pettitte's deposition validates the conversation, as Representative Davis said it did, then Clemens is going to have a much harder time convincing the House Committee on Oversight and Government Reform that McNamee was merely injecting him with a healthy dose of legal vitamins. Now, instead of just disputing the testimony of McNamee — a somewhat shady character to begin with — Clemens is also contradicting Andy Pettitte, who is (a) Clemens's best friend, (b) a relatively honest guy since he came clean about the HGH, and (c) a two-time twenty-game winner. More important, Pettitte has no reason to lie. (Clemens's claim that his fellow pitcher is simply "misremembering" sounds pretty weak.) Add to this McNamee's recent delivery of allegedly tainted old syringes and gauze pads to authorities, and Clemens isn't going on the mound tomorrow looking too good.