Serious Core Four Mo Mariano Rivera Derek Jeter Andy Petitte
Some Perspective on Yankee Openers in the Derek Jeter Era
Core 4 reunited before Yankees' home opener
Derek Jeter enters the Hall of Fame - Oral history of the Yankees
Brian Cashman, Mariano Rivera and others pay tribute to Derek
Minor League University: SMALLS TALK: The Yankee Core
On this day in Yankees history - Jeter and Posada play in their
Lot of (4) New York Yankees Core Four OML Baseballs Signed by (4
Derek Jeter , Andy Pettitte , Jorge Posada And Mariano Rivera
Un-four-gettable: The Core values its role in Derek Jeter's final