Pettitte’s return adds to the list of un-retirements in sports in recent memory, the most famous of which being Brett Favre, Roger Clemens and Michael Jordan.
A comeback from retirement is a gamble on how the public will remember the end of your career. Some comebacks make teams wish you never left. Others make you look like a fool for ever thinking you still had what it takes.
The best example of the unpredictable nature of this gamble is Michael Jordan. His return to basketball in 1995 led to three more championships; however his second return in 2001, with the Washington Wizards, forever stained his legacy.
Comebacks are a tricky thing. Have a look at which pitchers did it successfully, and which ones failed miserably.