Roger Clemens' lawyer Rusty Hardin began his first extended cross-examination of key prosecution witness Brian McNamee by explaining that he would set up a chart to list McNamee's recollections as a mistake, a case of bad memory or a lie, according to an MLB.com report.

Though he hadn't used the chart by the time court recessed Wednesday, Hardin had peppered McNamee with questions about his claims that Clemens asked for a "booty shot" -- a term that now has been used dozens of times in the trial -- during the 1998 season, MLB.com reported.

Hardin questioned the witness about statements McNamee made before Congress and in his direct testimony earlier in the week, attempting to destroy McNamee's credibility, MLB.com reported. He also suggested that McNamee is looking to capitalize on the situation, particularly since he and Clemens appeared before Congress in 2008, MLB.com reported..

"Ever since Feb. 13, 2008, would you agree with me that you've been trying to take advantage of the fame you achieved with Roger Clemens?" Hardin asked, with McNamee responding that he hasn't, MLB.com reported.

McNamee is the key government witness in the case against the seven-time Cy Young Award winner. Clemens is accused of lying to Congress in 2008 when he denied using steroids and human growth hormone. McNamee testified earlier this week that he injected Clemens in 1998, 2000 and 2001, MLB.com reported.