Jeter, Rivera, Pettitte, Posada Signed Baseball. Yankees Core Four. JSA

The Core 4—Derek Jeter, Mariano Rivera, Andy Pettitte, and Jorge Posada—are indeed legends, not just for their talent, but also for the incredible achievement they made together over the span of nearly two decades. Their success is particularly remarkable because of the era in which they played, a time when free agency and the rise of big-money contracts made team continuity harder to maintain.  

The nickname highlights their importance to the franchise during an era of Yankees dominance. It was not just about having great players—it was about having great players who could win together year after year in a high-pressure environment. The Yankees’ success during that time wasn’t just about individual brilliance; it was about the cohesion of those four, who complemented each other in ways that few other combinations of players ever have.  

In the modern MLB, it is nearly impossible to have such sustained success with the same group of players. Free agency, the luxury tax, and other factors make it difficult to retain core players, especially those in the prime of their careers. The current trend toward player movement, along with the increase in the power of agents and front offices, has resulted in much less stability than the Yankees had in the late '90s and early 2000s.  

It’s also worth noting that these four were all standout players in their own right: Mariano Rivera was a unanimous first-ballot Hall of Fame inductee; Derek Jeter received every first-ballot vote except for one from an anonymous writer; and both Andy Pettitte and Jorge Posada have recently been mentioned as potential Hall of Fame candidates (review their career résumés for more details).

These baseballs were signed in the latter part of 2009 during a special, one-time signing session. Due to their limited availability at the time, they were in short supply and sold out almost immediately. During that period, it seemed the entire hobby was rushing to buy one, and as a result, most of these balls have been tucked away and rarely seen on the market since. We were fortunate to be offered one at a reasonable market price—and, of course, we didn’t hesitate to purchase it. The ball is a Gem Mint beauty, with pristine snow-white color and flawless autographs from all four players, written in blue ballpoint pen. Most importantly, each signature appears on the same panel, making for an ideal display presentation. The ball is an official MLB baseball and has been authenticated by JSA, with the full letter of authenticity included.

A rare gem in both Condition and Scarcity (our credo), this ball is a must-have for any serious collector. Don’t miss the chance to own this flawless piece of Yankees history