In a move that seemingly came out of nowhere, the Milwaukee Brewers have traded third baseman Caleb Durbin, utility infielders Andruw Monasterio and Anthony Seigler and their competitive balance B pick to the Boston Red Sox. In return, Milwaukee acquired left-handed starter Kyle Harrison, infielder David Hamilton and minor league left-hander Shane Drohan.
Harrison, 24, was ranked as a top 25 prospect in the league by both Baseball America and MLB Pipeline ahead of the 2024 season. He made his major league debut with the Giants in 2023, but was the centerpiece of San Francisco’s deal for Rafael Devers last June. In 42 career appearances (37 starts, 194 2/3 innings), Harrison has a 4.39 ERA, 4.43 FIP and 2.85 K:BB ratio. In the minors, however, Harrison has a 3.39 ERA in over 350 innings and has struck out 13.7 batters per nine, a huge number for a starter.
Hamilton, 28, is a fast, versatile defender who doesn’t hit much. He was a former draft pick of the Brewers and was sent to the Red Sox in the Hunter Renfroe trade a few years ago. He was a very good player in 2024, when he hit .248/.303/.395 (96 OPS+) in 98 games at age 26 and played good defense between second base and shortstop. He earned 2.6 bWAR that season, but couldn’t repeat that success in 2025, hitting just .198/.257/.333 in 194 plate appearances in 91 games.
Drohan has yet to make his Major League debut. He turned 27 last month and was a fifth-round pick by Boston in 2020. Drohan missed much of the 2025 season with forearm inflammation, but when healthy he performed extremely well: In 47 2/3 innings at Triple-A Worcester, he had a 2.27 ERA, 12.7 K/9 and 3.0 BB/9.
Durbin was the Brewers’ starting third baseman in 2025, a role that now appears up for grabs. He was a big part of the Brewers’ 97-win team last year, earning 2.8 WAR in a promising rookie season. He doesn’t turn 26 until later this month and won’t be a free agent until he’s past his prime, and it seemed like Durbin was going to be a big part of the Brewers’ future. While there are some reasons to be skeptical about his offensive game given his Statcast numbers, this move is quite a surprise.
Monasterio was the team’s primary infielder for the past three seasons and was solid, likeable and reliable in that role. Seigler had a disappointing first season in the Majors, but there were reasons for optimism in some of his underlying numbers and he was also a versatile player.
Hamilton can certainly replace Monasterio in the utility infield role, but we now have a real question: Who is the Brewers’ starting third baseman on Opening Day?
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