With jury selection complete, both sides make their opening arguments in the trial of Roger Clemens for perjury. It is clear that the central issue will be the credibility of Clemens’ former trainer, Brian McNamee, who has supplied much of the prosecution’s key evidence and will be its star witness. For its part, the defense argues that “Clemens’ only crime was having the poor judgment of staying connected with McNamee”, claiming that none of the allegations are founded and that the physical evidence is the result of tampering.