It was a deal that few saw coming, but on February 9, 2026, the Boston Red Sox and Milwaukee Brewers shook up the baseball landscape with a blockbuster trade that sent shockwaves through both clubhouses. Just as pitchers and catchers were set to report for Spring Training, the Brewers dealt third baseman Caleb Durbin, utility infielders Andruw Monasterio and Anthony Seigler, and a Competitive Balance Round B draft pick to Boston. In return, Milwaukee received left-handed pitcher Kyle Harrison, infielder David Hamilton, and left-handed pitching prospect Shane Drohan. This move not only reshapes both rosters but also raises plenty of questions and excitement heading into the new season.
For Boston, the need for infield depth had grown increasingly urgent as the offseason progressed. Caleb Durbin, who will turn 26 later this month, is coming off a rookie campaign that saw him finish third in the National League Rookie of the Year voting. He hit .256 with 11 home runs, 53 runs batted in, and 18 stolen bases over 136 games for the Brewers in 2025. His ability to play multiple infield positions—logging 131 games at third base, 10 at second, and three at shortstop—makes him a versatile asset for Red Sox manager Alex Cora, who now has a wealth of options to tinker with as Opening Day approaches.
Chief Baseball Officer Craig Breslow couldn’t contain his excitement when discussing Durbin’s arrival. “Really like a lot of what Caleb brings to the table: strong defender, strong bat-to-ball skills, really versatile right-handed hitter and also feel like he’s a good fit for our park just given the profile of hitting the ball in the air to the pull-side,” Breslow said on Monday. “Versatility in terms of where he can play and still feel like his best days are ahead of him given his age and control and we’re excited to get him into our organization.”
Durbin’s debut season was impressive not just for his numbers, but for his approach at the plate. He posted a .256/.334/.387 slash line, racked up 114 hits (including 25 doubles), and ranked in the 98th percentile in MLB for strikeout rate with just a 9.9% K rate. He was hit by a pitch an NL-leading 24 times, showing his willingness to do whatever it takes to get on base. His speed—ranking in the 70th percentile in sprint speed—adds another dimension to Boston’s already athletic lineup.
Joining Durbin in Boston are Andruw Monasterio and Anthony Seigler, both of whom bring additional infield depth. Monasterio, 28, has been a reliable utility infielder for the Brewers over the past three seasons, while Seigler, 26, was a first-round pick by the Yankees in 2018 and debuted in the majors last season. While neither is known for their power, both offer positional flexibility and, in Seigler’s case, a left-handed bat for the bench.
The Red Sox didn’t just bolster their infield—they also gained significant team control, with Durbin under contract through 2031. “We’ve talked about the importance of defense, the importance of balancing out the lineup, thinking about our pitching staff and their ability to manage hard contact and keep the ball on the ground, converting balls in play into outs is going to be something that’s really important to our success,” Breslow added. “We’ve largely addressed that and we have options. We’ll see how camp plays out but feel confident in the group and their ability to help contribute in terms of turning balls in play into outs.”
For Milwaukee, the centerpiece of the return is Kyle Harrison, a 24-year-old left-hander who was once ranked among the top 25 prospects in baseball. Harrison made his major league debut with the Giants in 2023, then was traded to Boston in the Rafael Devers deal last June. He split the 2025 season between the Giants and Red Sox, making six starts and five relief appearances, posting a 4.04 ERA with 38 strikeouts in 35.2 innings. In his minor league career, he’s struck out 13.7 batters per nine innings, a tantalizing figure for a Brewers organization that has become known for developing young pitching talent.
Brewers President of Baseball Operations and General Manager Matt Arnold praised Harrison’s potential, saying, “Kyle Harrison provides an exciting young left-handed arm to our starting rotation options this season. At just 24, he already has valuable Major League experience under his belt, and we look forward to watching him progress as a Brewer.”
David Hamilton, 28, returns to the organization that drafted him in 2019. After being sent to Boston in the 2021 Hunter Renfroe trade, Hamilton made his Red Sox debut in 2023. He enjoyed a solid 2024 season, hitting .248 with 2.6 bWAR, but struggled offensively in 2025, batting just .198 in 91 games. Still, his speed and defensive versatility—he’s capable at both second base and shortstop—make him a strong candidate to fill the utility infielder role vacated by Monasterio.
Shane Drohan, 27, rounds out the package heading to Milwaukee. Drohan missed much of the 2025 season with forearm inflammation but was excellent when healthy, posting a 2.27 ERA with 12.7 strikeouts per nine innings in 47 2/3 frames at Triple-A Worcester. He’s yet to make his major league debut, but with the Brewers’ reputation for maximizing pitching talent, Drohan could be an under-the-radar addition to their staff.
The trade does leave Milwaukee with a big question mark at third base, as Durbin was a key contributor to their 97-win campaign last year, amassing 2.8 WAR and playing a major role in the infield. Andruw Monasterio’s departure further depletes their depth, and Anthony Seigler, while versatile, had a disappointing first major league season. Brewers fans are left to wonder: who will man the hot corner on Opening Day?
As for the Red Sox, this trade is being hailed by many as a shrewd move that addresses a glaring weakness. With Durbin, Monasterio, and Seigler in the fold, Boston’s infield is deeper and more versatile than it’s been in years. The departure of Harrison, Hamilton, and Drohan does thin out the pitching depth, but with several young arms still in the system, the Red Sox appear confident in their ability to absorb those losses.
Spring Training now looms with both teams facing intriguing roster battles and new faces vying for key roles. For the Brewers, the competition for third base is wide open, while the Red Sox will look to integrate Durbin and their new infielders into a lineup that suddenly looks much more balanced. With Opening Day just around the corner, fans in both cities will be watching closely to see how this bold trade shapes their teams’ fortunes in 2026 and beyond.
One thing’s for sure: this deal has set the stage for a fascinating season ahead in both Boston and Milwaukee. The baseball world will be watching to see which team reaps the greater rewards from this high-stakes exchange.