Originally posted on FOX Sports  |  By By Ken Rosenthal  |  Last updated 9/20/13
The Core Four is losing yet another member. New York Yankees left-hander Andy Pettitte will announce his retirement on Friday, according to major-league sources. Yankees closer Mariano Rivera also will retire at the end of the season. Catcher Jorge Posada last played in 2011, leaving shortstop Derek Jeter as the only member of the fabled Core Four that is still active. Pettitte, 41, has continued to pitch effectively this season, going 10-10 with a 3.93 ERA in 28 starts. But he is on a one-year contract and offered no assurances that he would pitch again in 2014. The retirement of Pettitte and pending free agency of right-hander Hiroki Kuroda will leave the Yankees with at least two holes in their rotation. Pettitte is 255-152 with a 3.86 ERA lifetime, and 19-11 with a 3.81 ERA in 44 career post-season starts. He pitched in eight World Series, winning with the Yankees in 1996, '98, '99, 2000 and '09 while losing with the Yankees in '01 and '03 and the Astros in '05. Pettitte ...
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