Marcelo Mayer has been placed on the 10-day injured list with a bone stress reaction to the left ulna, according to CR Today. The Boston Red Sox announced the decision on May 27, 2026, as they continue to face a series of injuries in the infield.[1]
What happened
Mayer, previously the starting second baseman, transitioned to shortstop after Trevor Story was sidelined with a sports hernia injury in mid-May. Mayer’s condition forced the team to make a quick decision, as Isiah Kiner-Falefa, a likely candidate to fill in at shortstop, was also placed on the injured list earlier this week due to the same issue.
In light of these injuries, the Red Sox recalled infielder Tsung-Che Cheng from Triple-A Worcester for his Major League debut against the New York Yankees on the same day. Mayer reported that he had been dealing with the injury for nearly two months, stating, “It’s just been on and off. Some days have been worse than others.”
“I had a talk with the medical staff, with the doctors, they pretty much said to put a stop to it, or it could possibly get worse,” Mayer said regarding the decision to be placed on the IL.
Why it matters
The Red Sox are struggling with a 33-46 record, significantly underperforming expectations this season. Injuries have compounded the team’s challenges, which may affect their competitiveness in upcoming games. Continued setbacks could have long-term implications for the roster and season performance.[2]
Chad Tracy, the Red Sox’s interim manager, acknowledged the impact of the injuries, stating, “Yeah, we’ve taken some hits… You just have to move on and have the next guy up to help us and go out and win a ballgame.”
Background
On May 20, 2026, Trevor Story was placed on the injured list, prompting Mayer’s shift to shortstop. Kiner-Falefa’s injury followed shortly, further deepening the infield’s woes. Mayer had consistently faced injuries since his Minor League career, raising concerns about his long-term impact on the team.
Through 70 games this season, Mayer had a batting average of .220 with three home runs and 22 RBIs. The Red Sox selected him with the fourth pick in the 2021 Draft, hoping he would become a reliable shortstop.[3]
What’s next
The Red Sox will monitor Mayer’s recovery and weekly evaluations have been scheduled. Meanwhile, Cheng and Andruw Monasterio are expected to share shortstop duties until more clarity on Mayer’s timeline emerges.
