On the morning of the trade announcement, the Boston Red Sox finalized a major six-player deal with the Milwaukee Brewers, bringing infielder Caleb Durbin to Boston. Both teams confirmed the transaction, noting that all six involved players were already on their respective 40-man rosters, so no roster shuffling was immediately required. The Red Sox’s acquisition includes infielder Durbin, catcher/infielder Anthony Seigler, Andruw Monasterio, and a Competitive Balance Round B draft pick. Milwaukee received three players: left-handed pitchers Kyle Harrison and Shane Drohan, along with infielder David Hamilton.
Caleb Durbin Set to Strengthen the Red Sox Infield
Caleb Durbin represents a significant addition to Boston’s infield plans, expected to secure regular playing time, likely at third base. However, he can also cover second base if the team opts to station prospect Marcelo Mayer at third for defensive reasons. The 25-year-old Durbin, who will turn 26 soon, finished third in National League Rookie of the Year voting in 2025 after posting a .256/.334/.387 slash line with 11 home runs, 25 doubles, and 18 stolen bases (on 24 attempts). Durbin also demonstrated excellent defensive skills at third base, with above-average Defensive Runs Saved (5) and Outs Above Average (2) metrics.
Though he may not deliver the middle-of-the-order power that some fans hoped for, Durbin’s value lies in his versatility, affordability, and defense-first approach. His ability to put the ball in play could help the Red Sox reduce their strikeout rate, which ranked 10th highest in MLB last year at 22.9%. As a right-handed hitter with a pull-heavy approach (43.3% pull rate versus a 40.6% league average), Durbin’s style could be advantageous at Fenway Park’s Green Monster left field wall. Importantly, he comes with five full seasons of club control remaining and two minor league option years, though a demotion seems unlikely following his strong rookie campaign.
Roster Composition and Position Battles
If Durbin anchors third base, second base duties are expected to rotate between left-handed hitter Marcelo Mayer and right-handed batter Romy Gonzalez. Utility player Isiah Kiner-Falefa, recently signed, will provide backup across these positions and shortstop. Additionally, 28-year-old Andruw Monasterio joins the fold, offering flexibility across second and third bases. Like Gonzalez and Kiner-Falefa, Monasterio bats right-handed and exhibits significant platoon splits; he has hit better against left-handed pitchers (.255/.352/.375) than right-handers (.246/.303/.338) throughout his career.
Monasterio enjoyed a career-best showing in 135 major league plate appearances last season, batting .270/.319/.437 with four home runs and an overall 111 weighted runs created plus (wRC+). He remains under team control for four more seasons and is not arbitration-eligible until next offseason or possibly later depending on time spent in the minors. His versatility extends to shortstop, having logged nearly 3,500 professional innings at the position, providing insurance for the often-injured Trevor Story at shortstop along with Kiner-Falefa. Despite this, Monasterio’s spot on the Opening Day roster is uncertain; his three minor league options remain intact, so he may start in the minors if the team opts for a bench composed mainly of Gonzalez, Kiner-Falefa, catcher Connor Wong, and designated hitter/outfielder Masataka Yoshida.
Prospects and Depth Considerations
Mayer’s status for Opening Day is still under evaluation. Despite a subpar 2025 with a .228/.272/.402 slash line, his impressive minor league track record and young age (just 23) suggest he has a path to winning a starting role. However, the recent acquisitions of Durbin and Kiner-Falefa reduce Boston’s immediate dependence on Mayer’s development. Seigler, at 26, bolsters the Red Sox’s organizational depth as a versatile infielder and catcher. While his major league batting line (.194/.292/.210 in 73 plate appearances) leaves much to be desired, his Triple-A performance last year was strong: a .285/.414/.478 slash with eight home runs, 16 doubles, four triples, 23 stolen bases, and a notable 16.9% walk rate. Seigler has transitioned recently from catcher to more frequent use at second base due to issues controlling the running game and passed balls, but he remains a valuable bench option with two minor league options and six years of team control remaining.
Implications of the Competitive Balance Draft Pick
The Red Sox also gained a Competitive Balance Round B draft pick in the deal, MLB’s only trade-eligible draft selection. Currently the first pick in Round B (around 67th overall), this pick carries an approximate slot value near $1.3 million, which will augment Boston’s overall draft bonus pool and provide additional opportunities to sign talent. This strategic addition offers further organizational flexibility during upcoming drafts.
Brewers Face Infield Challenges Following Trade
From Milwaukee’s perspective, this trade may signal impending adjustments to their infield. Trading away Durbin along with two additional infield depth players — Hamilton and Monasterio — has left the Brewers thin at third base and potentially other infield spots. Hamilton, capable of playing third base and primarily experienced at second, is projected to see substantial reps at third base during spring training. However, the Brewers must determine whether Hamilton’s outstanding defensive prowess at second base will translate effectively to the hot corner. Other infielders like shortstop Joey Ortiz and second baseman Brice Turang, both excellent defenders, might be moved to cover spots, but such shifts risk weakening the infield’s overall defense. Given the scarcity of third base options, further moves to reinforce the position seem likely for Milwaukee’s front office, led by president of baseball operations Matt Arnold.
Pitching Assets Included in Milwaukee’s Return
The Brewers gained two pitchers in the trade who are ready to contribute at the major league level. Kyle Harrison, 24, has appeared in 42 MLB games, including 37 starts, with a 4.39 ERA, a 22.9% strikeout rate, and an 8% walk rate. Seen as a potential fifth starter, Harrison was once recognized as the 26th overall prospect by Baseball America in 2023 and carries considerable upside despite not yet fully realizing it in the majors. His minor league statistics include over 30% strikeouts in parts of two Triple-A seasons. Milwaukee is known for its advanced pitching development strategies, previously transforming pitchers like Quinn Priester and multiple relievers. They are optimistic Harrison can join that list of success stories.
The other pitching acquisition, Shane Drohan, recently turned 27 and has battled injuries and setbacks in recent years, including nerve decompression surgery and forearm issues that limited his innings. Despite these challenges, Drohan ranked 15th in Boston’s prospect system and posted impressive numbers last season at Triple-A Worcester, with a 2.27 ERA, a 35.3% strikeout rate, and a 17.3% swinging-strike rate across 47 2/3 innings. His repertoire includes a fastball averaging 93.3 mph and a mix of off-speed pitches, making him a promising depth option for Milwaukee’s pitching staff.
David Hamilton Returns to Brewers with Defensive Strengths
David Hamilton, 28, returns to Milwaukee after being initially drafted by the Brewers in 2019 and traded to Boston as part of the 2021 Hunter Renfroe deal. Though his major league hitting (.222/.283/.359) has been modest in parts of three MLB seasons, Hamilton boasts exceptional speed and elite defensive skills, ranking in the 95th percentile for sprint speed. His 57 career steals reflect this. He has been a standout defender at second base, accumulating 16 Defensive Runs Saved and 8 Outs Above Average in just 679 innings. Milwaukee’s familiarity with Hamilton from the draft and front office connections likely influenced his reacquisition. Hamilton will compete for third base reps in spring training, with his ability to adapt a key factor in whether he makes the Opening Day roster. He retains a minor league option year, allowing flexibility for the Brewers in managing their roster.
Red Sox Infield Depth Solidified, Brewers Anticipate Further Moves
For the Red Sox, this deal brings considerable infield stability, complemented by glove-first utility players like Kiner-Falefa. Durbin’s contact-oriented hitting and defensive skills should incrementally improve Boston’s overall run prevention and make their lineup more consistent, even though the offense may still rely heavily on the top-tier hitters. On the Brewers’ side, the trade expands their pitching depth to between 10 and 12 candidates, setting the stage for potential additional trades or a robust rotation through the demanding 162-game season. However, the infield void created by the departures likely requires further reinforcements from the front office soon.
Trade news: The Boston Red Sox are acquiring third baseman Caleb Durbin in a trade with the Milwaukee Brewers, sources tell ESPN. Left-hander Kyle Harrison is headlining the three-player package headed back to Milwaukee.
— Jeff Passan (@JeffPassan) February 9, 2026
Infielder David Hamilton and left-hander Shane Drohan are the other two players going to Milwaukee along with Kyle Harrison in the Caleb Durbin deal, sources tell ESPN.
— Jeff Passan (@JeffPassan) February 9, 2026
Red Sox also getting Monasterio, Seigler and Comp B pick, league sources said.
Milwaukee also getting Hamilton and Drohan as @JeffPassan first reported. https://t.co/T4pnSqK5DK
— Will Sammon (@WillSammon) February 9, 2026
With Durbin, Monasterio and Seigler heading to Boston the Brewers are wide open at third base eight days before the first full-squad workout of Spring Training. Leading candidate as things stand now may be David Hamilton. Plan is for him to get lots of reps at 3B this spring.
— Adam McCalvy (@AdamMcCalvy) February 9, 2026
