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Core Four
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, and a fifth in 2009.
Jeter, Pettitte, Posada, and Rivera were drafted or signed as amateurs by the Yankees in the early 1990s. They played together in the minor leagues and were all promoted to the major leagues in 1995. By 2007, they were the only remaining Yankees from the franchise's dynasty of the previous decade. All four players were on the Yankees' active roster in 2009 when the team won the 2009 World Series—its fifth championship in the previous 14 years. Three members of the Core Four—Jeter, Rivera and Posada—played together for 17 consecutive years (1995–2011), longer than any other similar group in the history of North American professional sports. Pettitte had a sojourn away from the team when he played for the Houston Astros for three seasons, but returned to the Yankees in 2007. He retired after the 2010 season, reducing the group to the so-called Key Three. Posada followed suit after 2011, ending his 17-year career with the Yankees. Pettitte came out of retirement prior to the 2012 season and played for two more years. Both Pettitte and Rivera retired after the 2013 season, and Jeter retired after the 2014 season.
The four members of the Core Four are now regarded as some of the greatest Yankees players of all time. All four were honored at Monument Park, while Jeter and Rivera were both inducted into the National Baseball Hall of Fame. Notably, Rivera is the only unanimous pick in the Hall of Fame's history, while Jeter fell one vote short of unanimous selection himself. Posada became eligible in 2017, but received only 3.8% of the vote and was dropped off of the ballot, although he may still be inducted by the Veterans Committee. Pettitte is currently still on the ballot, but has only accumulated 48.5% of the vote (opposed to the necessary 75% needed for induction) as of the 2026 ballot, his eighth ballot.
Derek Jeter, Mariano Rivera, Jorge Posada, and Andy Pettitte all joined the New York Yankees organization in the early 1990s as amateurs. Rivera signed as an international free agent in February 1990. The Yankees selected Pettitte in the 22nd round and Posada in the 24th round of the 1990 Major League Baseball draft. Jeter was selected in the first round, with the sixth overall selection, of the 1992 Major League Baseball draft.
Together, the Core Four progressed through the Yankees minor league system in the early 1990s. It was during their tenure with the Oneonta Yankees of the Class A-Short Season New York-Penn League in 1991 that Posada, initially an infielder, began catching for his future major league batterymate Pettitte. The latter threw a knuckleball at the time, which Posada struggled to catch (hitting him mostly on the knee), prompting Pettitte to abandon the pitch. Promoted to the Greensboro Hornets of the Class A South Atlantic League in 1992, Posada and Pettitte met Jeter, a highly regarded prospect, who had been assigned to the team. Posada and Pettitte initially questioned the hype surrounding Jeter, but soon recognized his talent and poise. Rivera injured his elbow in 1992 and had surgery in August to repair the damage. While Rivera was pitching for Greensboro in 1993 on a strict pitch count, Jeter kept track of the count from shortstop.
The four first played together with the Class AAA Columbus Clippers of the International League in 1994. All four made their major league debuts in 1995. Both Jeter and Rivera reached the major leagues in May, but were demoted back to the minors in June and bounced around between the minors and major leagues throughout the year. Posada made his major league debut in September, and along with Pettitte and Rivera, was included on the Division Series roster.
Jeter, Posada, and Rivera played in the same MLB game for the first time on September 28, 1996. That season, Jeter, Pettitte and Rivera won their first championship together (Posada was left off that year's postseason roster).
Jeter became the Yankees all-time hits leader on September 11, 2009, with his 2,722nd hit, surpassing Lou Gehrig. On July 9, 2011, against the Tampa Bay Rays, he collected his 3,000th hit, becoming the 28th player to reach the milestone. Derek Jeter was the first Yankee to accomplish the feat and collect all 3,000 hits with the team, the first player to reach the milestone with a New York team, the fourth-youngest player to reach the mark, the second to do it by hitting a home run, the second to reach the mark in a five-hit game, and the first to attain the milestone playing shortstop exclusively. Furthermore, Jeter broke Rickey Henderson's franchise record for stolen bases on May 28, 2011, when he stole his 327th base against the Mariners. Jeter's third milestone in 2011 was breaking Mickey Mantle's record for most games played as a Yankee, accomplishing this on August 28, 2011 against the Orioles. In 2000, he became the only player to win both the World Series Most Valuable Player (MVP) Award and the All-Star Game MVP in the same season. His #2 was retired on May 14, 2017.
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Core Four
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, and a fifth in 2009.
Jeter, Pettitte, Posada, and Rivera were drafted or signed as amateurs by the Yankees in the early 1990s. They played together in the minor leagues and were all promoted to the major leagues in 1995. By 2007, they were the only remaining Yankees from the franchise's dynasty of the previous decade. All four players were on the Yankees' active roster in 2009 when the team won the 2009 World Series—its fifth championship in the previous 14 years. Three members of the Core Four—Jeter, Rivera and Posada—played together for 17 consecutive years (1995–2011), longer than any other similar group in the history of North American professional sports. Pettitte had a sojourn away from the team when he played for the Houston Astros for three seasons, but returned to the Yankees in 2007. He retired after the 2010 season, reducing the group to the so-called Key Three. Posada followed suit after 2011, ending his 17-year career with the Yankees. Pettitte came out of retirement prior to the 2012 season and played for two more years. Both Pettitte and Rivera retired after the 2013 season, and Jeter retired after the 2014 season.
The four members of the Core Four are now regarded as some of the greatest Yankees players of all time. All four were honored at Monument Park, while Jeter and Rivera were both inducted into the National Baseball Hall of Fame. Notably, Rivera is the only unanimous pick in the Hall of Fame's history, while Jeter fell one vote short of unanimous selection himself. Posada became eligible in 2017, but received only 3.8% of the vote and was dropped off of the ballot, although he may still be inducted by the Veterans Committee. Pettitte is currently still on the ballot, but has only accumulated 48.5% of the vote (opposed to the necessary 75% needed for induction) as of the 2026 ballot, his eighth ballot.
Derek Jeter, Mariano Rivera, Jorge Posada, and Andy Pettitte all joined the New York Yankees organization in the early 1990s as amateurs. Rivera signed as an international free agent in February 1990. The Yankees selected Pettitte in the 22nd round and Posada in the 24th round of the 1990 Major League Baseball draft. Jeter was selected in the first round, with the sixth overall selection, of the 1992 Major League Baseball draft.
Together, the Core Four progressed through the Yankees minor league system in the early 1990s. It was during their tenure with the Oneonta Yankees of the Class A-Short Season New York-Penn League in 1991 that Posada, initially an infielder, began catching for his future major league batterymate Pettitte. The latter threw a knuckleball at the time, which Posada struggled to catch (hitting him mostly on the knee), prompting Pettitte to abandon the pitch. Promoted to the Greensboro Hornets of the Class A South Atlantic League in 1992, Posada and Pettitte met Jeter, a highly regarded prospect, who had been assigned to the team. Posada and Pettitte initially questioned the hype surrounding Jeter, but soon recognized his talent and poise. Rivera injured his elbow in 1992 and had surgery in August to repair the damage. While Rivera was pitching for Greensboro in 1993 on a strict pitch count, Jeter kept track of the count from shortstop.
The four first played together with the Class AAA Columbus Clippers of the International League in 1994. All four made their major league debuts in 1995. Both Jeter and Rivera reached the major leagues in May, but were demoted back to the minors in June and bounced around between the minors and major leagues throughout the year. Posada made his major league debut in September, and along with Pettitte and Rivera, was included on the Division Series roster.
Jeter, Posada, and Rivera played in the same MLB game for the first time on September 28, 1996. That season, Jeter, Pettitte and Rivera won their first championship together (Posada was left off that year's postseason roster).
Jeter became the Yankees all-time hits leader on September 11, 2009, with his 2,722nd hit, surpassing Lou Gehrig. On July 9, 2011, against the Tampa Bay Rays, he collected his 3,000th hit, becoming the 28th player to reach the milestone. Derek Jeter was the first Yankee to accomplish the feat and collect all 3,000 hits with the team, the first player to reach the milestone with a New York team, the fourth-youngest player to reach the mark, the second to do it by hitting a home run, the second to reach the mark in a five-hit game, and the first to attain the milestone playing shortstop exclusively. Furthermore, Jeter broke Rickey Henderson's franchise record for stolen bases on May 28, 2011, when he stole his 327th base against the Mariners. Jeter's third milestone in 2011 was breaking Mickey Mantle's record for most games played as a Yankee, accomplishing this on August 28, 2011 against the Orioles. In 2000, he became the only player to win both the World Series Most Valuable Player (MVP) Award and the All-Star Game MVP in the same season. His #2 was retired on May 14, 2017.