The Mariners are adding Mitch Garver to their Opening Day roster as their backup catcher, according to a report from Ryan Divish of the Seattle Times. That seemingly leaves catcher Andrew Knizner without a spot on the club’s roster headed into the season. He’s on a $1MM contract for 2026 and cannot be optioned to the minors, so he’ll need to be traded or designated for assignment sometime before Opening Day if he isn’t making the team.
Garver, 35, is a veteran of nine MLB seasons and has spent the past two years in Seattle. The former Silver Slugger has spent much of his career on the injured list, but in his younger years often showed flashes of elite power when healthy coupled with a hefty dose of strikeouts. From 2019 to 2023, Garver appeared in 325 games (averaging just 65 per season) but in that time slashed a phenomenal .250/.346/.508 with 75 home runs, a 26.6% strikeout rate, and an 11.8% walk rate. Perhaps the most impressive of those five seasons was his 2023 campaign with the Rangers, where he made it into 87 games and clubbed 19 homers with a strikeout rate of just 23.8% against an impressive 12.8% walk rate.
It was a platform season strong enough that the Mariners decided to take a chance on Garver, signing him to the club’s first multi-year deal for a position player in years. Unfortunately, that contract did not go well. Garver’s offense has taken a big step back over the past two years as the strikeouts have returned while his power has dipped substantially. In 201 games with Seattle, he’s hit just .187/.290/.341 with a 29.6% strikeout rate and a wRC+ of 88, indicating he’s been 12 points worse than league average at the plate. He’s combined that with lackluster defensive numbers behind the plate, and the Mariners were widely expected to move on from the veteran this offseason.
Despite that, Garver re-signed with the club on a minor league deal at the outset of Spring Training. Contact has remained an issue for him this spring, as he’s gone just .182/.308/227 with 11 strikeouts in 26 trips to the plate during camp. That lackluster performance both in Seattle and during camp this spring makes the decision to go with Garver as the backup a somewhat surprising one. That’s particularly true given that Knizner is not only on a minor league contract but also has the five years of service time required to reject an outright assignment and retain his full salary even if he passed through waivers unclaimed following a DFA.
Of course, it should be remembered that Knizner is hardly an impact player in his own right. The veteran has appeared in parts of seven MLB seasons but is a career .211/.281/.316 hitter whose 2025 season was even less productive at the dish than Garver’s. Knizner is younger at 31 years old and has been viewed in some circles as a superior defender to Garver, but his metrics have actually been similar to Garver’s work in 2025 throughout much of his career. Given that Raleigh figures to play the overwhelming majority of games behind the plate, perhaps the Mariners are prioritizing bringing back a veteran leader from a club that fell just one game short of the World Series last year who Raleigh himself helped to bring back into the organization over the offseason.
Regardless of the reasoning, Garver now figures to serve as Raleigh’s backup, while Knizner is likely to be either traded or exposed to waivers before the season begins. If he goes unclaimed, he’ll have the opportunity to return to free agency and sign with any of the league’s 30 clubs. Given the dearth of catching depth around the league in recent years, Knizner could conceivably find a big league job somewhere, though it’s also possible he’ll have to settle for a minor league pact at this point and begin the season at Triple-A.
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