Members of the Yankees "Core Four," from left, former Yankees catcher Jorge Posada, reliever Mariano Rivera, New York Yankees shortstop Derek Jeter, and former Yankees starting pitcher Andy Pettitte pose together after Rivera and Pettitte threw out the ceremonial first pitch to Jeter and Posada before a baseball game against the Baltimore Orioles, at Yankee Stadium in New York, Monday, April 7, 2014. (AP Photo/Kathy Willens)