The"Core Four" are formerNew York Yankeesbaseball playersDerek Jeter,Andy Pettitte,Jorge Posada, andMariano Rivera. Each member of the Core Four was a key contributor to the Yankees' late-1990s and early 2000sdynasty that won fourWorld 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 theminor leagues and were all promoted to the major leagues in 1995. By2007, they were the only remaining Yankees from the franchise's dynasty of the previous decade. All four players were on the Yankees' active roster in2009 when the team won the2009 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),[1] longer than any other similar group in thehistory of North American professional sports.[2] Pettitte had a sojourn away from the team when he played for theHouston Astros for three seasons, but returned to the Yankees in2007. He retired after the 2010 season,[3] reducing the group to the so-calledKey Three.[4] Posada followed suit after 2011, ending his 17-year career with the Yankees.[5] Pettitte came out of retirement prior to the 2012 season and played for two more years.[6] Both Pettitte and Rivera retired after the 2013 season, and Jeter retired after the2014 season.[7]
The four members of the Core Four are now regarded as some of the greatest Yankees players of all time. All four were honored atMonument Park, while Jeter and Rivera were both inducted into theNational 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 theVeterans 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, andAndy Pettitte all joined theNew York Yankees organization in the early 1990s as amateurs. Rivera signed as an international free agent in February 1990.[8] The Yankees selected Pettitte in the 22nd round and Posada in the 24th round of the1990 Major League Baseball draft. Jeter was selected in the first round, with the sixth overall selection, of the1992 Major League Baseball draft.[9]
Together, the Core Four progressed through the Yankees minor league system in the early 1990s. It was during their tenure with theOneonta Yankees of theClass A-Short SeasonNew York-Penn League in 1991 that Posada, initially an infielder, began catching for his future major league batterymate Pettitte.[10] The latter threw aknuckleball at the time, which Posada struggled to catch (hitting him mostly on the knee), prompting Pettitte to abandon the pitch.[10] Promoted to theGreensboro Hornets of theClass ASouth 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.[11] 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 strictpitch count, Jeter kept track of the count from shortstop.[12]
The four first played together with theClass AAAColumbus Clippers of theInternational League in 1994.[13] All four made their major league debuts in 1995.[14] 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.[10][15] Posada made his major league debut in September, and along with Pettitte and Rivera, was included on theDivision Series roster.[15]
Jeter, Posada, and Rivera played in the same MLB game for the first time on September 28, 1996.[4] That season, Jeter, Pettitte and Rivera won their first championship together (Posada was left off that year's postseason roster).[10]
Jeter became the Yankees all-timehits leader on September 11, 2009, with his 2,722nd hit, surpassingLou Gehrig.[16] On July 9, 2011, against theTampa Bay Rays, he collected his3,000th hit,[17] 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,[18][19] the first player to reach the milestone with a New York team,[20] the fourth-youngest player to reach the mark,[21] the second to do it by hitting ahome run, the second to reach the mark in a five-hit game,[20] and the first to attain the milestone playingshortstop exclusively.[22] Furthermore, Jeter brokeRickey Henderson's franchise record forstolen bases on May 28, 2011, when he stole his 327th base against theMariners.[23] Jeter's third milestone in 2011 was breakingMickey Mantle's record for mostgames played as a Yankee, accomplishing this on August 28, 2011 against theOrioles.[24] In 2000, he became the only player to win both theWorld Series Most Valuable Player (MVP) Award and theAll-Star Game MVP in the same season.[25] His #2 was retired on May 14, 2017.
Pettitte holds the all-time record for postseason victories, with 19 wins in total.[26] Among Yankees pitchers, he ranks first instrikeouts (2,011)[27] and third inwins (213).[28][29] He was named the2001 American League Championship SeriesMost Valuable Player[30][31] and won theWarren Spahn Award in 2003 as the best left-handed pitcher in baseball.[32] His #46 was retired on 23 August 2015.
Posada is only the fifth major league catcher with at least 1,500 hits, 350doubles, 275 home runs, and 1,000runs batted in (RBIs) in a career,[33] and the only major league catcher to ever record a .330batting average or better with 40 doubles, 20 home runs, and 90 RBIs in a single season. He is only the second Yankees catcher to hit 30 home runs in a season, afterYogi Berra. Among Yankee catchers, Posada is first all-time in doubles (365),[34]walks (897),[35] andintentional walks (74),[36] and second in home runs (261)[37] and extra-base hits (636).[38] Among all Yankees players, Posada ranks sixth all-time ingrand slams (10).[39] On April 16, 2009, Posada hit the first home run at thenew Yankee Stadium.[40] His #20 was retired on August 22, 2015.
Rivera played 19 seasons with the Yankees (1995–2013), serving ascloser for 17 of them. He retired as MLB's career leader insaves (652) andgames finished (952), having surpassedTrevor Hoffman in both categories in 2011.[41][42] Rivera's careerearned run average (ERA) (2.21) andWHIP (1.00) are the lowest of any pitcher in thelive-ball era.[43] In thepostseason, he holds the MLB record for career saves (42) and ERA (0.71).[44] He also holds records for 15 consecutive seasons with 25 or more saves,[45] nine consecutive seasons with 30 or more saves, and 15 seasons with 30 or more saves.[46][47] From1996 through his final season in2013, he posted an ERA under 3.00 in all but one season (2007).[44] Selected as anAll-Star 13 times, he saved a record four All-Star Games, the last coming in2009.[48] On May 25, 2011, he became the 15th pitcher in major league history to make 1,000appearances, and the first to do so with a single team.[49][50] His appearances total ranks as the most inAmerican League history.[51] On September 22, 2013, Rivera became the first active Yankee player to have his number retired by the organization; he was the last major league player to wear number 42 full-time, following its league-wide retirement in honor ofJackie Robinson.[52]
He was elected to theBaseball Hall of Fame on January 22, 2019 with 100% of the vote, becoming the first player ever to be elected unanimously.[53]
The Core Four won four World Series Championships together in five years.[54] 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;[55]Bob Welch andDennis Eckersley previously held the record with 58.[56]
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.[57] 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 byLou Gehrig andTony Lazzeri.[58]
With the rise offree agency andtrades, many sportswriters believe that it is highly unlikely that another group of players of comparable size will spend their entire careers with a single team.[59][60]Buck Showalter, the Yankees manager during the Core Four's major league debuts in 1995, said, "[Y]ou won't see anything like this happen again. There are too many variables for that to ever happen again. And what you have to remember is the makeup of those guys. The common thread was their agenda. They didn't branch off. They didn't want to disappoint each other. They were guys who never wanted to let their teammates down."[15]
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 the2010 American League Championship Series to theTexas Rangers, citing his desire to spend more time with his family.[61] After spending the2011 season away from baseball, he served as a guest instructor for the Yankees during 2012spring training and insisted that he was not considering a comeback.[62] 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.[63] He pitched in both the2012 and2013 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.[64] 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.[65] He made his final appearance on September 28 against theHouston Astros, the only other team he had pitched for in his career. He pitched acomplete game—his first since 2006—and by winning his last start, he finished the season with an 11–11win–loss record. This preserved his records of never having a losing season throughout his 18-year career[66] and being the only pitcher in major league history to have 15 winning seasons (with a minimum of threestarts each) without recording a losing season.[67]
The second member of the group to retire was Posada. He endured a tumultuous2011 season that saw him lose the starting catcher job toRussell Martin, drop to 9th in the Yankeelineup after batting .165, bench himself, and then lose his spot in the lineup as the startingdesignated hitter altogether.[68][69] Posada had several memorable performances at the end of the year. He drove in the go-ahead runs that clinched theAmerican League East title for the Yankees[70] and batted .429 in the2011 American League Division Series against theDetroit Tigers. After the Yankees lost the series in Game 5, he cut short apostgame interview when he teared up, coming to the realization that it could have been his final game as a Yankee.[71] He announced his decision to retire on January 24, 2012.[72]
Rivera had hinted during 2012 spring training that the2012 season would be his last, and confirmed that his decision was "irrevocable."[73][74] He intended to reveal his decision at the end of the year, preferring a low-key departure instead of having a farewell tour across MLB stadiums.[75] However, he reversed his decision aftertearing hisanterior cruciate ligament (ACL) andpart of his meniscus whileshagging fly balls on May 3, 2012.[76] This prematurely ended his season, and though there were fears that this could potentially be a career-ending injury,[76][77] he stated that he would return, declaring that he was "not going down like this."[78]
After rehabilitating his injury through the offseason, Rivera announced on March 9 that he would retire at the end of the2013 season.[79] 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.[80] Each opposing team reciprocated the gesture by holding an on-field ceremony and honoring him with a parting gift.[81][82] On September 22, a day that was declared "Mariano Rivera Day" by theMayor of New York CityMichael Bloomberg, the Yankees held their own ceremony to honor Rivera, culminating in theretiring of his uniform number intoMonument Park.[83] Many former teammates of his were in attendance, including Posada, who threw out theceremonial first pitch to Rivera in a reversal of roles.[84]
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.[85]
| External image | |
|---|---|
 The Core Four on the Cover of Sports Illustrated 6 Months After The Yankees' 2009 World Series Victory |
| Derek Jeter[86] | Jorge Posada[87] | Record note | |
|---|---|---|---|
| Primary position | Shortstop | Catcher[A] | |
| Games played | 2,747(1st) | 1,829(8th) | Jeter holds Yankee record |
| At bats | 12,602(1st) | 6,092 | Jeter holds Yankee record |
| Runs scored | 1,923(3rd) | 900 | |
| Hits | 3,465(1st) | 1,664 | Jeter holds Yankee record |
| Home runs | 260(9th) | 275(8th) | |
| Runs batted in | 1,311(6th) | 1,065 | |
| Batting average | .310(7th) | .273 | |
| Stolen bases | 358(1st) | 20 | Jeter holds Yankee record |
| Hall of Fame | Elected |
(nth) indicates rank within the top 10 among Yankee all-time leaders as of September 29, 2014
| Andy Pettitte[88] | Mariano Rivera[89] | Record note | |
|---|---|---|---|
| Primary position | Starting pitcher | Relief pitcher[B] | |
| Games pitched | 447(5th) | 1,115(1st) | Rivera holds AL record |
| Innings pitched | 2,796+1⁄3(3rd) | 1,283+2⁄3 | |
| Wins | 219(3rd) | 82 | |
| Losses | 127(3rd) | 60 | |
| Saves | 0 | 652(1st) | Rivera holds MLB record |
| Earned run average[C] | 3.94 | 2.21(2nd) | |
| Strikeouts | 2,020(1st) | 1,173(8th) | Pettitte holds Yankee record |
| Walks | 889(4th) | 286 | |
| Hall of Fame | Elected | Rivera holds election percentage record (100%) |
(nth) indicates rank within the top 10 among Yankee all-time leaders as of September 29, 2014
