Mariners reportedly to acquire INF Brendan Donovan in three-team trade with Cardinals, Rays

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SAN FRANCISCO, CA - SEPTEMBER 24: St. Louis Cardinals second base Brendan Donovan (33) throws to first during the MLB professional baseball game between the St. Louis Cardinals and San Francisco Giants on September 24, 2025 at Oracle Park in San Francisco, CA. (Photo by Bob Kupbens/Icon Sportswire via Getty Images) | Icon Sportswire via Getty Images

The day after Justin Hollander and Jerry Dipoto both said at Fan Fest that the Mariners were still looking to make one impact move, they reportedly backed that up today with the most significant trade of the Mariners off-season, a three-team trade with the Rays and Cardinals that will bring long-anticipated trade target Brendan Donovan to Seattle. While we’re still waiting for the full details of the trade, which was broken by Jeff Passan, reportedly the Mariners are sending third baseman Ben Williamson to the Rays as part of it. We will update this article as more information emerges. Update: so far the trade involves the Mariners sending switch-pitching prospect Jurrangelo Cijntje to St. Louis, and sending third baseman Ben Williamson to Tampa Bay.

Adding Donovan solidifies an infield mix that was shaky for the Mariners after the free agency departure of Jorge Polanco, with a trio of youngsters in Cole Young, Ben Williamson, and Colt Emerson in the mix but question marks hanging over each. Williamson was the most sure thing of that crew defensively, already playing at a Gold Glove level clip; he’s now headed to Tampa Bay as part of the deal.

Donovan doesn’t come close to replacing Polanco’s power output, but he does offer a reliable presence in the lineup as a high-average player who refuses to strike out. At 29, he’s probably shown about all he will in the power department, with his peak of 14 homers coming in 2024. As a lefty swinger, Donovan will join the Mariners’ other lefty regulars Josh Naylor, J.P. Crawford, and whichever of Dominic Canzone/Luke Raley is playing RF/DHing.

Defensively, Donovan offers positional flexibility, having played major-league innings at every position except catcher and center field. He even won a Gold Glove, in the first year the committee recognized Utility players as a position. However, the bulk of his experience has come at second base, a position that is currently theoretically filled by Cole Young, with Ryan Bliss behind him. That means either Donovan will shift to third, or Cole Young or Colt Emerson will slot over there instead. Likely the Mariners will use spring training to sort out their best defensive alignment for the bats available.

In order to acquire Donovan, who is under team control for two more years, the Mariners had to send out the MLB-experienced Williamson as well as prospect Jurrangelo Cijntje, who cracked MLB Pipeline’s Top 100 list this year and ranks as the sixth or seventh prospect in the Mariners’ top ten, depending on the outlet. The Mariners had announced Cijntje as an NRI invite this year as a right-handed pitcher, saying he would be making right-handed starts while continuing to work on pitching left-handed in his bullpens and side work. His development will now be under the purview of the Cardinals. Cijntje will be the first first-round pick of the Jerry Dipoto era to not debut with the Mariners.

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