In an unsurprising move, Red Sox manager Alex Cora told reporters (including Peter Abraham of the Boston Globe) that Marcelo Mayer make the Opening Day roster and act as Boston’s regular second baseman. It isn’t quite an everyday role, as Cora said the left-handed hitting Mayer will be protected against some southpaw pitchers. Veteran infielder Isiah Kiner-Falefa or utilityman Andruw Monasterio are both right-handed batters and should be part of this platoon at the keystone.
Mayer didn’t exactly force the issue by hitting only .214/.389/.321 over 36 plate appearances in Grapefruit League action, but it always seemed like the former top prospect was being lined up for some type of regular role in the Red Sox infield as either the second or third baseman. After the Sox didn’t land such targets as Alex Bregman or Bo Bichette this winter, Caleb Durbin was acquired from the Brewers and will handle third-base duties, leaving second as Mayer’s landing spot.
Selected fourth overall in the 2021 draft, Mayer was a fixture within the top-15 of MLB Pipeline and Baseball America’s top-100 lists in each of the last four years. He made his big league debut last season and hit .228/.272/.402 over 136 plate appearances before suffering a wrist sprain that eventually required surgery. Mayer mostly played third base last year since his call-up coincided with an IL stint for Bregman, though he did make eight appearances at second base and two cameos at shortstop.
Mayer was initially drafted as a shortstop, and that could eventually still end up as his position in the majors once Trevor Story‘s contract is up following the 2027 season. For now, the plan is just to get Mayer acclimated to playing in the bigs and for the 23-year-old to establish himself as at least a solid regular. The Sox don’t need for Mayer to be a star just yet, as it’s a good step in his development for Mayer to just stay on the field altogether after a few injury-marred years.
In other roster news, the Red Sox have optioned Kristian Campbell to Triple-A Worcester, MassLive.com’s Chris Cotillo reports. This decision was also no surprise given the crowded state of Boston’s roster, and playing everyday in Worcester makes more sense for Campbell than playing sparingly in a part-time role with the Sox.
A year ago at this time, Campbell was preparing to make his MLB debut, as the Red Sox chose to include the breakout prospect on their Opening Day roster. A fourth-round pick for Boston in the 2023 draft, Campbell tore up minor league pitching in his first two pro seasons, and was hitting so well that he’d earned a promotion to Triple-A before the 2024 season was over. Within a week of his first game in the Show, the Red Sox cemented Campbell’s spot as a cornerstone by signing him to an eight-year, $60MM extension.
Everything seemed to be going smoothly when Campbell hit .313/.420/.515 over his first 119 PA in the majors, but what looked like an epic rookie season quickly came to a halt, as he hit only .157/.241/.220 over his next 141 PA. Campbell’s defense was also a big concern, as he posted -16 Defensive Runs Saved and -8 Outs Above Average across only 471 2/3 innings at second base.
The Red Sox chose to option Campbell to Worcester last June 20, and he didn’t receive another call-up over the remainder of the 2025 campaign. Campbell hit a decent but unspectacular .273/.382/.417 over 319 Triple-A PA, and he spent most of his time on the diamond as a first baseman, as well as seeing time at all three outfield slots in addition to second base.
Where Campbell might end up on the big league roster remains speculative. The Red Sox outfield is already crowded (Roman Anthony, Ceddanne Rafaela, Jarren Duran, Wilyer Abreu), plus Masataka Yoshida remains in the outfield and DH mix. Mayer and Durbin have second and third base covered for now. As for first base, offseason acquisition Willson Contreras has two years remaining on his contract, so that’s still a while for Campbell to wait if the Sox potentially now view him as Contreras’ heir apparent. Triston Casas is also still in the first base picture, looking to bounce back from his injury-shortened 2025 season.
Some future trades could potentially clear this situation up to some extent, with Duran, Casas, and Yoshida often mentioned as speculative trade candidates. Campbell’s contract keeps him part of Boston’s future plans and also probably keeps him off the trade market, as any interested teams would be making a $57MM investment in a belief that Campbell will emerge in the big leagues.
Let me be the first to say congratulations and good for him !!
Job well done and he has earned it.
Let’s hope Mayer doesn’t get benched too much against lefties.
And for the love of God, they need to stop assuming a RHB is always a better option against LHP.
IKF had a .536 OPS vs LHP last year and .643 for his career, Monasterio should be the one playing when Cora benches Mayer.
I think he probably will be. IKF to me is mostly for late game replacement, pinch running, and starting when others need a rest/are DTD
(just to be clear since I just said “he” in response to a post about 3 players: I think Monasterio will be the regular 2B option vs. LHP)
Meow – I think you’re right, but the thought of paying IKF $6M for such a limited role makes me nauseous. Glove-only bench players aren’t paid nearly that much.
Yeah I don’t really get the IKF signing when it feels like they could get almost everything he provides + more roster flexibility from Nick Sogard. But IKF has been a 2+ WAR player as recently as 2024 so he could end up being a sneaky value-add.
Meow – If the Durbin trade never happens, Mayer would be the 3B and IKF would have been the 2B. I think that’s all IKF was, insurance if they didn’t land any other infielder.
Campbell was smart to take that extension last year
Big – Just the fact he was the only one eager to take a team-friendly contract offer shows he didn’t have confidence in his abilities. I’m glad he got paid, he’s a great kid. Not his fault he got mismanaged so badly.
Mayer. 268 -18-73
Campbell may be the modern day Scott Kingery or Rusney Castillo.
I doubt it. He’d be claimed if the Red Sox tried to DFA him
Rick I think you’re in the ballpark.
There was absolutely no reason to rush an extension to Campbell last year. It’s now looking like a detriment rather than an asset. I’ll bet if he didn’t have that contract the Sox could have flipped him to Arizona for Marte.
There. We now have the confirmation that Mayer will be on the opening day roster and the starting 2B. I’m guessing the final roster spot right now is between Monasterio and Eaton unless they pull off a surprise trade or a bigger surprise release (Yoshida)