Over the last 20 years, the New York Yankees have claimed five World Series championships, seven American League Pennants and five AL East titles. The success of the Yankees has come in large part from the homegrown talents of the "Core Four."
Derek Jeter, Mariano Rivera, Jorge Posada and Andy Pettitte were certainly the faces of the Yankees dynasty—and arguably the most eccentric part of the success the Yankees had. However, the shrewd moves in free agency are what helped build this team into the force it has become.