The "Core Four" is down to two.
New York Yankees catcher Jorge Posada is planning to retire, a source told ESPN The Magazine's Buster Olney.
Posada, shortstop Derek Jeter, closer Mariano Rivera and left-handed pitcher Andy Pettitte compiled the core group that helped the Yankees win five World Series championships between 1996-2009.
Pettitte retired after the 2010 season.
Posada hit .235 with 14 home runs and 44 RBIs last season.
After Posada's final game last October, he was asked what playing for the Yankees had meant to him -- and he broke down in tears, before walking away from reporters.
Posada probably could have continued his career somewhere as a designated hitter and padded his career numbers of 275 home runs, 1,065 RBIs and 936 walks. But Posada always cherished the privilege and responsibility of being the Yankees catcher.
He viewed Thurman Munson as an idol, and converted from second base to catcher after being drafted by the Yankees in the 24th round of the 1990 draft.
Swinging with pine tar on his hands, and without batting gloves, he was a five-time All-Star, caught David Wells' perfect game in 1998, and played in 125 games in October. He is a borderline Hall of Fame candidate, but his legacy as a Yankee probably means more to him.
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