Core Four reunited at Yankees openerRivera, Pettitte, Posada drop in for Jeter's last home opener
Jeter caught a ceremonial first pitch from Mariano Rivera, and Jorge Posada caught one from Andy Pettitte prior to Monday's game against the Baltimore Orioles.
Posada retired after the 2011 season, and Rivera and Pettitte at the end of 2013.
Jeter announced in February that his 20th big league season will be his last.
Says Rivera: ''The last one standing is Derek.''