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.
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).
Pettitte holds the all-time record for postseason victories, with 19 wins in total. Among Yankees pitchers, he ranks first in strikeouts (2,011) and third in wins (213). He 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. His #46 was retired on 23 August 2015.
The Core Four won four World Series Championships together in five years. They won seven American League pennants together from 1996 to 2009.
Pettitte and Rivera hold the all-time record for most win–save combinations with 72; Bob Welch and Dennis Eckersley previously held the record with 58.
In 2010, Rivera, Jeter, and Posada became the first trio in any of the four North American major sports leagues to play together on the same team for 16 consecutive seasons. Posada and Jeter played their 1,660th game together on July 14, 2011. This broke the record for most regular-season games played together by two Yankee teammates, previously held by Lou Gehrig and Tony Lazzeri.
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. He 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. After spending the 2011 season away from baseball, he served as a guest instructor for the Yankees during 2012 spring training and insisted that he was not considering a comeback. However, he reversed his decision on his final day as instructor and rejoined the organization on March 16, signing a $2.5 million minor league contract. He pitched in both the 2012 and 2013 seasons for the Yankees before announcing his second retirement on September 20, 2013. Although he was initially not going to reveal his decision, it was at Rivera's insistence that he eventually did. The Yankees held a ceremony for Pettitte five days later on September 25, with fellow Core Four members Jeter and Rivera presenting him with a framed base from his final Yankee Stadium start, signed by all his teammates. He made his final appearance on September 28 against the Houston Astros, the only other team he had pitched for in his career. He pitched a complete game—his first since 2006—and by winning his last start, he finished the season with an 11–11 win–loss record. This preserved his records of never having a losing season throughout his 18-year career and being the only pitcher in major league history to have 15 winning seasons (with a minimum of three starts each) without recording a losing season.
After rehabilitating his injury through the offseason, Rivera announced on March 9 that he would retire at the end of the 2013 season. His farewell tour saw him meet the fans and unsung employees of opposing teams during his final visit to their ballparks to listen to their stories and thank them for supporting baseball. Each opposing team reciprocated the gesture by holding an on-field ceremony and honoring him with a parting gift. On September 22, a day that was declared "Mariano Rivera Day" by the Mayor of New York City Michael Bloomberg, the Yankees held their own ceremony to honor Rivera, culminating in the retiring of his uniform number into Monument Park. Many former teammates of his were in attendance, including Posada, who threw out the ceremonial first pitch to Rivera in a reversal of roles.
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.
(nth) indicates rank within the top 10 among Yankee all-time leaders as of September 29, 2014
(nth) indicates rank within the top 10 among Yankee all-time leaders as of September 29, 2014
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"Derek Jeter Statistics and History". Baseball-Reference.com. Sports Reference LLC. Retrieved August 22, 2011. https://www.baseball-reference.com/players/j/jeterde01.shtml
"Jorge Posada Statistics and History". Baseball-Reference.com. Sports Reference LLC. Retrieved August 22, 2011. https://www.baseball-reference.com/players/p/posadjo01.shtml
Posada also played 42 games at first base and 1 game at second during his career.
/wiki/First_baseman
"Andy Pettitte Statistics and History". Baseball-Reference.com. Sports Reference LLC. Retrieved August 22, 2011. https://www.baseball-reference.com/players/p/pettian01.shtml
"Mariano Rivera Statistics and History". Baseball-Reference.com. Sports Reference LLC. Retrieved August 22, 2011. https://www.baseball-reference.com/players/r/riverma01.shtml
Rivera also started 10 games (all during his 1995 rookie season). /wiki/1995_Major_League_Baseball_season
Minimum of 500 innings pitched for the Yankees.[90] /wiki/Innings_pitched