On Feb. 13, 2009, Clemens famously says longtime friend and teammate Andy Pettitte "misremembered" a discussion about performance-enhancing drugs and disputed the claims made by his former friend and personal trainer, Brian McNamee, who sat two seats away.

On Feb. 13, 2008, Clemens appears in front of House Committee on Oversight and Government Reform, even though leadership of the subcommittee tells the Clemens he doesn’t have to testify. Under oath, Clemens denies he ever used performance-enhancing drugs. Brian McNamee, former cop and Yankees bullpen catcher, testified he injected Clemens with banned substances as many as 21 times.

Clemens is one of 86 players named in the Mitchell Report, baseball’s independent investigation into steroid use in the game, released Dec. 13, 2007.

In 2005, Jose Canseco releases a bestselling book naming names in the steroid scandal. While the book says Clemens once joked about taking a "B-12" shot — baseball code for steroids —  Canseco admits he has no evidence Clemens ever actually used the performance-enhancing substance.

Clemens rejoined the New York Yankees during the 2007 season and retired at the end of that season. He won seven Cy Young Awards, more than any other pitcher. Clemens is one of only four pitchers to have more than 4,000 strikeouts in their career (the others are pitchers Nolan Ryan, Randy Johnson, and Steve Carlton).

Clemens chose to un-retire, signing a one-year deal with his adopted hometown Houston Astros on Jan. 12, 2004, joining close friend and former Yankees teammate Andy Pettitte. On May 5, 2004, Clemens recorded his 4,137th career strikeout to place him second on the all-time list behind Nolan Ryan. Clemens played three seasons with the Houston Astros, where he won his seventh Cy Young Award. 

Clemens was traded to the New York Yankees for the 1999 season, where he had his first World Series success. In 2003, he reached his 300th win and 4,000th strikeout in the same game. He announced his retirement at the end of the 2003 season.

The Toronto Blue Jays signed Roger Clemens in 1997. In each of his two seasons with the Toronto Blue Jays, Clemens won the pitching triple crown (leading the league in wins, ERA, and strikeouts) and a Cy Young Award.

Roger Clemens, nicknamed Rocket, broke into the majors with the Boston Red Sox whose pitching staff he would help anchor for 12 years. He played for four different teams over his 23-year playing career.

Clemens posted Hall-of-Fame worthy stats during his long and storied career, but is now mired in legal woes. As his trial proceeds, take a look back at how he got here.