David Ortiz has yet to follow up on his pledge to inform the public of what substance he tested positive for in 2003, saying he wants to be fully informed before speaking about it. While we wait for a response from Big Papi, we bring to you a roundup of how other professional athletes have reacted after their names were brought up as having used performance-enhancing drugs. Their reactions range from denial (Roger Clemens), to explaining why they took what they did (Rodney Harrison), to flat out apologizing (Jason Giambi, Andy Pettitte).