Yankees' Andy Pettitte to retire after season

He joined old buddies Rivera, Derek Jeter and Jorge Posada to make up the "Core Four'' that has led the Yankees to more than a decade and a half of sustained

Yankees left-handed pitcher Andy Pettitte announced he will retire at the end of the season :: Chris Carlson/AP

He joined old buddies Rivera, Derek Jeter and Jorge Posada to make up the "Core Four'' that has led the Yankees to more than a decade and a half of sustained success.

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