Andy Pettitte may not be the most dominate pitcher, he was never the ace of any rotation, but he won a lot of games. Sports are measured and defined by winning and Andy Pettitte did plenty of that in his career. Pettitte was part of 8 different World Series (7 with the Yankees 1 with the Astros) he won 5, all with the Yankees. He is part of core four along with Jeter, Rivera and Posada and a major part of the Yankee dynasty years.