Andy Pettitte conceded, while under cross-examination at the federal perjury trial of Roger Clemens, that there was a "50-50" chance that he misunderstood a conversation he had prior to the 2000 season in which he believed Clemens admitted using human-growth hormone. "What we do have is an indication that maybe he did mishear him," judge Reggie Walton said, echoing the same argument Clemens made at the 2008 hearing before Congress that is the basis for the case. Clemens is facing six federal charges stemming from his Feb. 5, 2008, deposition and his Feb. 13, 2008, appearance before the House Committee on Oversight and Government Reform, during which he denied ever using performance-enhancing drugs.