The 'Core Four' of Derek Jeter, Mariano Rivera, Jorge Posada & Andy Pettitte won four World Series Championships together as a unit, and were the
New York Yankees Core Four at Old Yankee Stadium 16x20 Photo Team-Signed by (4) Yankees Greats with Jorge Posada, Andy Pettitte, Mariano Rivera & Derek Jeter (Steiner COA)
Core Four - Wikipedia
The Core Four Yankees
Remembering The 1996 Yankees: Core Was Truly A Fantastic 4 - CBS New York
Core Four - Wikipedia
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Core Four - Wikipedia