The "Core Four" are former New York Yankees baseball players Derek Jeter, Andy Pettitte, Jorge Posada, and Mariano Rivera. 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.
The Core Four in 2015. From left: Andy Pettitte, Jorge Posada, Mariano Rivera, and Derek Jeter.
Andy Pettitte became the first of the Core Four to retire in 2011, but unretired in 2012.
Three members of the Core Four – Posada (left), Rivera (middle), and Jeter (right) – played together for 17 consecutive years from 1995 to 2011, the longest in North American professional sports.
Posada (left) and Rivera (right) shaking hands after the end of a game in 2009.
Andrew Eugene Pettitte is an American former professional baseball pitcher who played 18 seasons in Major League Baseball (MLB), primarily for the New York Yankees. He also pitched for the Houston Astros. Pettitte won five World Series championships with the Yankees and was a three-time All-Star. He ranks as MLB's all-time postseason wins leader with 19.
Pettitte with the New York Yankees in 2009
Pettitte pitching at Spring training in 2007
Pettitte (back right) and teammates from the 2000 World Series champion Yankees team pose with US President George W. Bush during a White House visit
Pettitte (left) with Nolan Ryan
