Infielder Brewers traded to Red Sox in Kyle Harrison trade promoted to MLB roster

Every time Kyle Harrison takes the mound for the Milwaukee Brewers, their offseason trade with the Boston Red Sox seems to look better and better. The 24-year-old southpaw, who is under team control through the 2030 season, is currently sporting a 1.57 ERA, a 32% strikeout rate, and looks like one of the best young pitchers in the game.

Harrison was the headliner of the Brewers' return in an early February trade with the Red Sox that sent Caleb Durbin, Anthony Seigler, Andruw Monasterio, and a 2026 Competitive Balance Round B pick to Boston. Milwaukee also acquired Shane Drohan and David Hamilton in the deal.

Through the first two months of the 2026 season, the trade really couldn't look more lopsided. Durbin is slashing .186/.251/.287 with a 54 OPS+, and has forced Boston to reconsider their infield options. Monasterio hasn't been much better, with a .239/.286/.370 slash line to prove it.

Meanwhile, not only has Harrison emerged as a key piece of the Brewers' starting rotation, but Drohan has played an important role on Milwaukee's pitching staff as well. In 31.1 innings pitched, which includes two appearances as a starting pitcher and 10 as a reliever, Drohan has a 2.87 ERA and a 28% strikeout rate. Hamilton is still waiting for his bat to come around, but in the meantime, he's getting on base, in large part due to his MLB-leading 10 bunt singles. The speedy Hamilton also leads the Brewers with 13 stolen bases on the season.

Perhaps the most overlooked aspect of the trade is Seigler, who battled a knee injury through the first two weeks of the season and was then assigned to Triple-A back on April 10. Though Seigler struggled with the Brewers in his debut season last year, the Red Sox are hoping the versatile infielder can offer some value and make their offseason deal look less lopsided. Earlier today, Seigler was promoted to the Red Sox' big-league roster and will make his Boston debut in the coming days.

Red Sox promote Anthony Seigler to MLB roster for the first time in 2026

Just as he did with the Brewers' Triple-A affiliate a season ago, Seigler impressed at the top level of Boston's minor league system over the last month and a half. The utility infielder posted an .896 OPS with three homers, 10 doubles, and 21 RBI over the last 30 games with the WooSox, making him more than deserving of another major league opportunity.

Despite his promotion earlier today, Seigler is not in the Red Sox' lineup for their matchup with the Baltimore Orioles tonight, but with both Durbin and Marcelo Mayer struggling at the plate, it's only a matter of time before Seigler makes his Red Sox debut.

Regardless of how good of a showing Seigler turns in at the plate, it's going to be hard for the Red Sox to make up for the loss of trading Harrison to the Brewers. The young southpaw looks like a clear-cut All-Star on June 3, and given just how valuable controllable starting pitching is in today's game, making up for that lost value is certainly an uphill battle for the Red Sox. That said, a strong showing from Seigler could at least make things a little better for a Boston fanbase that has seen both Quinn Priester and Harrison thrive in a Brewers' uniform after their team traded them away.

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