The Boston Red Sox made the first major move of free agency on Friday afternoon, signing former Milwaukee Brewers first baseman Jake Bauers to a four-year, $58-million contract. 

The 30-year-old left-hander broke out in a big way at the plate in 2026 and provides a significant upgrade to a Red Sox lineup that desperately needed one; however, his signing creates major roster issues for the Red Sox. 

Here's what you need to know about how Bauers impacts the Red Sox roster. 

According to Chris Cotillo of MassLive.com, the Red Sox plan to rotate Bauers and Willson Contreras between first base and designated hitter. Over 2,974 innings at first base, Bauers has been a below-average defender, posting -7 defensive runs saved, -9 outs above average, and -12 fielding run value.

However, Contreras has a long injury history and will enter his age-35 season. Late in the regular season, the three-time All-Star dealt with several ailments, including a hamstring strain that significantly hampered him before he eventually landed on the injured list. 

Cycling Bauers and Contreras through the DH spot will hopefully keep Contreras at full strength throughout the regular season and postseason. 

With Bauers and Contreras set to handle first base and designated hitter duties, the Red Sox clearly have plans to clear the outfield logjam. With Roman Anthony, Ceddanne Rafaela, and Wilyer Abreu expected to be outfield mainstays, Jarren Duran and Masataka Yoshida are the clear odd men out. 

Red Sox President of Baseball Operations Craig Breslow recently did his best to downplay the need to clear the outfield logjam, saying that it hasn't really presented an issue because all five outfielders have rarely been healthy at the same time. However, with Duran projected to make $11 million in arbitration and Yoshida owed $18 million in the final year of his contract, it seems unlikely the team will commit $29 million to a pair of bench players, with no clear path to consistent playing time. 

By far the biggest takeaway from the GM Meetings this week was that the team is looking to trade Duran, with one rival executive telling USA Today’s Bob Nightengale they would be “stunned” if Duran wasn’t traded this offseason. With Bauers officially in the fold, Duran's fate seems all but sealed. 

However, moving on from Yoshida's contract may be harder without a prospect sweetener, and with an already depleted farm system, the team may be left to use Yoshida as a pinch-hitter while playing out the final year of the deal. 

At the team's end-of-season press conference, Red Sox manager Chad Tracy told reporters that the team was broadly planning for trade deadline acquisition Curtis Mead to be the team's everyday second baseman. Mead profiles as a below-average defender across the board; however, with first base and designated hitter now occupied by the Bauers/Contreras tandem, it would stand to reason that Mead is now locked in at second base.