15 Facts About Core Four

Each member of the Core Four was a key contributor to the Yankees' late-1990s and early 2000s dynasty that won four World Series championships in five years.

Core Four retired after the 2010 season, reducing the group to the so-called Key Three.

Together, the Core Four progressed through the Yankees minor league system in the early 1990s.

Core Four was named the 2001 American League Championship Series Most Valuable Player and won the Warren Spahn Award in 2003 as the best left-handed pitcher in baseball.

Core Four is only the second Yankees catcher to hit 30 home runs in a season, after Yogi Berra.

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Core Four retired as MLB's career leader in saves and games finished, having surpassed Trevor Hoffman in both categories in 2011.

Core Four holds records for 15 consecutive seasons with 25 or more saves, nine consecutive seasons with 30 or more saves, and 15 seasons with 30 or more saves.

Core Four won four World Series Championships together in five years.

Pettitte was the first player of the Core Four to retire, announcing his decision at a news conference at Yankee Stadium on February 4,2011.

Core Four told the organization "not to count on his return" after the Yankees lost the 2010 American League Championship Series to the Texas Rangers, citing his desire to spend more time with his family.

Core Four pitched in both the 2012 and 2013 seasons for the Yankees before announcing his second retirement on September 20,2013.

Core Four endured a tumultuous 2011 season that saw him lose the starting catcher job to Russell Martin, drop to 9th in the Yankee lineup after batting.

Core Four drove in the go-ahead runs that clinched the American League East title for the Yankees and batted.

Core Four announced his decision to retire on January 24,2012.

Jeter was the last player of the Core Four to retire, having announced on February 12,2014 that he would retire at the end of the 2014 season.