Mariners Designate Jackson Kowar For Assignment

The Mariners announced they’ve designated reliever Jackson Kowar for assignment. That opens a 40-man roster spot for catcher Jhonny Pereda, whom they acquired from the Twins in exchange for cash considerations. Minnesota had designated Pereda for assignment last week when they signed free agent catcher Victor Caratini to a two-year contract.

Kowar, 29, is a former supplemental first-round pick of the Royals. He allowed 79 runs in 74 innings over parts of three seasons with Kansas City. They swapped him to the Braves for injured starter Kyle Wright over the 2023-24 offseason. Kowar’s time with the organization lasted less than a month, as the Braves flipped him to Seattle as part of the multi-player deal that sent Jarred Kelenic to Atlanta.

It was a change-of-scenery sequence involving a number of former high draft picks, but none of the players involved performed as hoped. Kowar blew out during his first Spring Training as a member of the Mariners. He underwent Tommy John surgery and was out of action until May ’25. He was on and off the active roster for the next few months until suffering a season-ending shoulder impingement in August.

Kowar has ultimately made just 15 appearances in a Seattle uniform. He allowed eight runs over 17 innings, walking seven while recording 15 strikeouts. The Florida product gave up nine runs (five earned) across 16 Triple-A innings. He has an 8.21 earned run average with a 20.3% strikeout rate and elevated 13.1% walk percentage across 91 MLB innings.

Primarily a fastball-changeup pitcher earlier in his career, Kowar cut back on the change while ramping up his slider usage last season. It resulted in a few more whiffs in his Triple-A time, though his control remains an issue. He sits around 97 MPH with the fastball and could intrigue teams based on the arm speed and his draft pedigree despite the grisly MLB numbers. He’s out of options, so he’d need to break camp or again be designated for assignment if another team is willing to give him an offseason 40-man spot.

Pereda is a well-traveled depth catcher who has divided his 48 major league games between three teams. He debuted with 20 appearances for the Marlins two seasons ago and combined for 28 games between the A’s and Minnesota last year. The 29-year-old (30 in April) has hit .241 without a home run in 118 major league plate appearances. He has a strong upper minors track record, batting .296/.392/.419 in just shy of 1000 career Triple-A plate appearances.

The Venezuelan-born Pereda has a good arm and a generally solid defensive reputation. He also has a minor league option, so the M’s can send him back to Triple-A for the 2026 season. They signed Andrew Knizner to a $1MM free agent deal to work behind Cal Raleigh. Trading Harry Ford had left them without any other catchers on the 40-man roster. Pereda has a leg up on non-roster invitee Nick Raposo as the top depth option in case either of their MLB catchers suffer an injury. Knizner is a career .211/.281/.316 hitter, so it’s not out of the question that Pereda outplays him for the backup job during the season.