Red Sox fans will have new use for No. 11 jerseys thanks to Marcelo Mayer

The Boston Red Sox officially signaled a new era at Fenway Park on Tuesday, confirming a series of roster updates that serve as a symbolic changing of the guard. In the most significant development, 23-year-old shortstop Marcelo Mayer has officially transitioned from jersey No. 39 to No. 11. The change assigns Mayer the digits most recently donned by franchise cornerstone Rafael Devers following his blockbuster trade to the San Francisco Giants in June.

For Red Sox fans, the move represents far more than a routine offseason change, instead symbolizing a clear passing of the torch. As reflected on MLB.com’s current roster listings, the number change is already in place. Devers wore No. 11 for nine seasons, a tenure highlighted by three All-Star selections, two Silver Slugger Awards, and the 2018 World Series championship. Now, Mayer inherits that legacy as he enters the 2026 season fully healthy and poised to play a central role in Boston’s lineup after a rookie campaign shortened by injury.

The clubhouse shuffle extends beyond the 23-year-old to accommodate key offseason acquisitions. Veteran catcher and first baseman Willson Contreras, who was acquired from the St. Louis Cardinals on December 21, has been assigned his signature No. 40. To facilitate this move, utility player Nate Eaton voluntarily switched from No. 40 to No. 18, graciously clearing the way for the ten-year veteran to retain his preferred uniform number.

This change in numbering revitalizes the No. 11 jerseys seen throughout the stands. Although the name on the back reflects a former era, the number has been repurposed for what lies ahead. While fans may need to update the nameplate to stay current, the jersey itself has immediately regained its significance.

As the organization looks toward the 2026 season, the jersey reassignment reinforces Mayer’s status as a cornerstone of the Red Sox’s future and underscores the franchise’s commitment to building around its emerging young core for long-term success.

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