Boston Red Sox 2026 Position Analysis: First Base

After a near-constant revolving door at first base over the past few seasons, the Boston Red Sox believe they have found their answer at the cold corner for the next couple of seasons thanks to a trade that sent starting pitching back to the St. Louis Cardinals. The team is hoping to get far more production from first base than they have in recent memory, and it looks like they’ve set themselves up to do just that. What was once a position of weakness for the Red Sox suddenly looks like a major strength as we head into the 2026 season.

Red Sox First Basemen At A Glance

Starter: Willson Contreras

Backup: Isiah Kiner-Falefa

Depth: Andruw Monasterio, Mickey Gasper, Triston Casas, Romy Gonzalez (Both will start 2026 on the IL)

Prospects: Nathan Hickey

Red Sox fWAR Ranking Last Year: 22nd out of 30

Red Sox fWAR Projection This Year: 14th out of 30

The Good

Arguably the best move Craig Breslow made this offseason was to acquire Contreras from the Cardinals in a trade that sent starting pitching prospects back to the rebuilding club. Contreras is a pull-ball hitter and has a veteran's plate approach. He’s got some power to boot, and playing half of his games at Fenway Park should bump his home run totals up by at least a few in 2026. He’s going to provide a steady presence at the cold corner for the next two seasons, possibly three if the club exercises his 2028 option.

Behind him, Kiner-Falefa has showcased his stellar defense across the diamond during spring training and, while an offensive downgrade when he’s in the lineup, is another veteran presence on this team of young guns. Don’t be shocked to see Monasterio leapfrog Kiner-Falefa for that backup job though, as he’s been one of the biggest standouts in camp so far and has likely earned a spot on the Opening Day roster. Like Kiner-Falefa, Monasterio can play all over the infield so his positional versatility plays right into Alex Cora’s plans. 

The Bad

Notably, Contreras has a bit of an injury history. Most of those came when he was still a catcher, but it’s something to keep in mind moving forward. He’s also currently 33 and will turn 34 during the season, so he’s no spring chicken. Behind Monasterio and Kiner-Falefa, the Red Sox are thin at first base, at least for now. Waiting in the wings, and coming back sooner than many expected, is Triston Casas. He’s going to be looking to shed his ‘injury-prone’ label and provide a spark that many have been clamoring for since he debuted. Casas has 30-plus home run power, but we’ve yet to see a completely healthy season from him. When Casas returns to the major-league roster he’s likely going to be featured more as a designated hitter than a first baseman, but he will become the primary backup for Contreras at that point.

Behind Casas, we have Gonzalez, who will begin the season on the 60-day IL as he’s recovering from recent shoulder surgery. Gonzalez should see the field at some point this season, and his success against left-handed pitching will help him once he’s healthy, but his spot is going to quickly come up for discussion if Monasterio continues to be the breakout performer he’s been in camp.

The Bottom Line

Willson Contreras will be a net-positive for the Red Sox, full stop. He’s going to contribute on both sides of the field and will step into a clubhouse leader role with ease. His bat should anchor the middle of the lineup, and hitting at Fenway Park should do nothing but bump his numbers in a positive direction. Once Casas is able to return to the 26-man roster, then the team will be at full strength.

The Red Sox are finally stable at first base, and those are words that haven’t been said since at least 2018. While the cold corner isn’t as demanding as the rest of the infield, finally having legit major-league production from the position will help give the Red Sox the edge they need to compete for the AL East title in 2026.