Mariners, Giants “Front-Runners” For Brendan Donovan

The Mariners and Giants have emerged as front-runners in the sweepstakes for super-utility man Brendan Donovan, according to a report from Katie Woo of The Athletic. Woo added that both clubs are also engaged with the Diamondbacks on Ketel Marte.

Both Seattle and San Francisco have previously been reported to have interest in Donovan’s services, which Woo notes the Cardinals are seeking multiple top prospects in exchange for. With that being said, they were often mentioned as just two of many teams interested in the versatile infielder; Donovan’s market has been said to encompass more than half the league, with the Pirates, Royals, Guardians, and Astros standing among the other teams that have been connected to him this winter.

That makes the Mariners’ and Giants’ “front-runner” status a notable shift in the status quo, and Woo goes as far as to mention specific prospect names being discussed with both clubs. In talks with Seattle, Woo reports that the Cardinals have discussed top pitching prospect Jurrangelo Cijntje and outfielder Lazaro Montes. The pair are Seattle’s #7 and #3 prospects, respectively, according to MLB Pipeline. In talks with the Giants, Woo writes that the names of infielder Gavin Kilen and southpaw Carson Whisenhunt have come up. Kilen is San Francisco’s #2 prospect per Pipeline, while Whisenhunt ranks #7.

Cijntje has garnered some buzz around the baseball industry due to his status as a switch pitcher who throws from both the right and left sides. He’s a more well-regarded pitcher from the right-hand side, touching the upper 90s with his right arm but being relegated to the low 90s with his left. In his pro debut in 2025, Cijntje pitched to a 3.99 ERA overall across the High-A and Double-A levels but actually got better after his promotion. In seven starts at Double-A, Cijntje turned in a 2.67 ERA across 33 2/3 innings of work with a 25.5% strikeout rate and an 11.0% walk rate.

Montes entered the 2025 season as a consensus top-100 prospect in the sport but scuffled a bit after being promoted to the Double-A level. He hit a solid but unspectacular .213/.319/.433 in 64 games at the level with a 30.5% strikeout rate. That’s hardly exciting production, but some of those struggles can be forgiven considering he was one of just four hitters under the age of 21 to reach 200 plate appearances in the Texas League last year, joined by Sebastian Walcott, Walker Jenkins, and teammate Michael Arroyo.

Kilen was San Francisco’s first-round pick in the 2025 draft. As a result, he has just ten professional games under his belt where he hit a lackluster .205/.279/.282. With that said, the University of Tennessee product hit an incredible .357/.441/.671 in his final collegiate season and was roundly viewed as a plus contact hitter despite questions about his power potential and ability to handle shortstop at the big league level.

As for Whisenhunt, the 25-year-old already made his big league debut earlier this year with a 5.01 ERA across five starts. While it was hardly an exciting pro debut, Whisenhunt did manage to post a 4.41 ERA in 21 starts in Triple-A’s Pacific Coast League despite the extremely unfriendly environment for pitchers at that level. He profiles as a possible mid-rotation arm with a profile carried by a plus-plus changeup.

Of course, it’s possible that these are only a handful of prospects St. Louis is discussing with the two suitors. It should also be noted that Donovan is far from the only avenue either club is pursuing for their vacancy at second base. The Mariners had been in rather public pursuit of a reunion with Jorge Polanco until he signed with the Mets yesterday, but they’ve still be connected to Marte in addition to Donovan. Woo suggests that Polanco’s departure could leave the Mariners more motivated to make a deal in the coming days, and perhaps that could indicate that Seattle is the more aggressive suitor of the two.

Woo describes the Giants, by contrast, as “exploring all options” as they look to upgrade over Casey Schmitt and Tyler Fitzgerald at second base. In addition to Marte, Brandon Lowe is also known to be available on the trade market while teams have also inquired after Cubs infielder Nico Hoerner. The infield market in free agency is tilted more towards the left side, but Alex Bregman has expressed a willingness to play second base in the past, shortstop Ha-Seong Kim has experience at the position, and Bo Bichette has long been viewed as a potential candidate to move off shortstop at some point. San Francisco hasn’t been directly tied to any of those players, of course, but all stand out as at least plausible acquisitions to be made by a team searching for second base help.