Jackson Kowar: Breaking News, Rumors & Highlights

Features

When Jackson Kowar ended the past season, he was originally slated to be one of the team's long relievers in 2026. Instead, he was designated for assignment in late January and eventually claimed by the Minnesota Twins on Dec 3.

Minnesota Twins News / Minnesota Twins on SI / February 3

Twins Claim Former First-Round Pick With 8.21 Career ERA in MLB

The Twins have claimed former Royals first-round pick Jackson Kowar off waivers, the team announced on Tuesday. He's a 6'5" right-handed pitcher who was recently designated for assigment by the Mariners.

MLB News / MLB Trade Rumors / February 3

Twins Claim Jackson Kowar

The Twins have claimed right-hander Jackson Kowar off waivers from the Mariners, according to announcements from both clubs. Seattle had designated him for assignment a week ago when they acquired catcher Jhonny Pereda from the Twins.

MLB News / Yardbarker Quizzes

The 'Home run leaders by MLB team' quiz

How many of the career leaders in home runs for every MLB franchise can you name in five minutes?

The 'First Baseball Hall of Fame induction ceremony' quiz

The 'MLB active home run leaders' quiz

The 'MLB 30/30 seasons' quiz

Seattle Mariners News / Seattle Mariners on SI / January 28

Seattle Mariners designate veteran relief pitcher for assignment

The Seattle Mariners have somewhat surprisingly designated reliever Jackson Kowar for assignment on Tuesday. The move was made to clear a spot on the 40-man roster for newly-acquired catcher Jhonny Peredes.

MLB News / Yardbarker

25 MLB players who have the most to prove in 2026

The new MLB season brings opportunities as players head into their walk years and try to rebound from subpar performances. These 25 players stand out heading into 2026.

Should Red Sox trade for former All-Star infielder?

Mariners getting needed bat in All-Star Brendon Donovan via three-team deal with Cardinals, Rays

Giants CEO calls Dodgers a 'dragon to slay'

Yankees' latest endeavor points to a Jasson Dominguez mistake waiting to happen

Top of Phillies' rotation is elite, but also comes with questions

Athletics News / Lookout Landing / January 27

Mariners acquire C Jhonny Pareda from Twins, designate RHP Jackson Kowar for assignment

Hot on the heels of adding to their pitching depth with Cooper Criswell entering the fold, the Mariners have made a small move to bolster their options on the other end of the battery.

Seattle Mariners News / MLB Trade Rumors / January 27

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.

Seattle Mariners News / MLB Trade Rumors / August 19

Mariners select young righty in a series of moves

The Mariners announced a series of roster moves Tuesday, including the previously-reported reinstatement of Bryce Miller from the 15-day injured list. They also selected the contract of fellow righty Sauryn Lao.

Seattle Mariners News / Lookout Landing / August 1

Mariners pitcher Trent Thornton to the Injured List with torn achilles, RHP Jackson Kowar recalled from Tacoma

Reliever volatility proves true not just because of the player profile, but also due to the whims of the baseball gods. Last night’s 6-0 good vibes romp at home the Seattle Mariners had over a rival Rangers team was married by only one blemish.

Seattle Mariners News / MLB on ClutchPoints / July 30

Mariners option pitcher after Caleb Ferguson trade

The Seattle Mariners are making strategic moves ahead of the stretch run, activating newly acquired left-handed reliever Caleb Ferguson and optioning Jackson Kowar to Triple-A Tacoma.

MLB News / Yardbarker

The 25 greatest pitching seasons from the modern MLB era

America's favorite pastime has more memorable performances than any sport. As such, figuring out which pitchers had the best seasons ever is no easy task.

Seattle Mariners News / Seattle Mariners on SI / July 30

Seattle Mariners Option Veteran Reliever to Make Room For Trade Acquisition

The Seattle Mariners didn't waste anytime making room for their new trade acquisition. The Mariners traded for left-handed reliever Caleb Ferguson in return for minor league right-handed pitcher Jeter Martinez on Wednesday.

Seattle Mariners News / Seattle Mariners on SI / July 24

Seattle Mariners Recall Right-Handed Reliever, Option Rookie Left-Hander

The Seattle Mariners reshuffled the bullpen again before a seven-game road trip, which begins with a four-game series against the Los Angeles Angels at 6:38 p.m.

Click here to get Yardbarker's Quiz of the Day emailed to you!

The 'Super Bowl halftime show artists' quiz

The 'NFL active TD-pass leaders' quiz

The 'NFL playoff receptions leaders' quiz

The 'Super Bowl XLIX starters' quiz

Seattle Mariners News / Seattle Mariners on SI / June 16

Seattle Mariners Option Right-Handed Reliever to Triple-A Tacoma Rainiers

SEATTLE — The Seattle Mariners will welcome back the ace of its starting rotation for a series-opener against the Boston Red Sox, while a right-handed reliever will be heading back to the Triple-A Tacoma Rainiers.

Seattle Mariners News / MLB Trade Rumors / May 28

Mariners reinstate righty Jackson Kowar from the 60-day IL

The Mariners announced that right-hander Jackson Kowar has been reinstated from the 60-day injured list. The 40-man roster had a vacancy due to right-hander Jesse Hahn being designated for assignment last week but is now full.

Seattle Mariners News / Seattle Mariners on SI / May 28

Seattle Mariners Make Major Roster Move Before Wednesday Game

WEDNESDAY, 3:25 p.m. PT: Kowar has been activated officially, with Logan Evans being the corresponding move to Triple-A. Evans just threw eight innings of brilliant ball on Tuesday night.

Seattle Mariners News / Seattle Mariners on SI / May 28

Former Seattle Mariners Trade Acquisition Nearing Team Debut After Lengthy Injury Battle

After a lengthy recovery from Tommy John surgery, hard-throwing reliever Jackson Kowar is nearing his debut with the Seattle Mariners. Speaking with the media on Tuesday, general manager Justin Hollander said that Kowar is "basically ready" for activation.

Seattle Mariners News / Minor League Baseball on SI / May 9

Pair of Seattle Mariners Relievers Set to Join Triple-A Tacoma on Rehab Assignments

The Seattle Mariners pitching staff has been racked with injuries since the season began, both to the starting rotation and the bullpen. And two potentially critical relievers are headed to the Pacific Northwest on respective rehab assignments.

Seattle Mariners News / Lookout Landing / March 20

40 in 40 2025: Jackson Kowar

Waiting for Jackson to come back, son It’s hard not to compare Jackson Kowar to Brady Singer. The two pitched together at the University of Florida and were taken by the same team (the Royals) in the 2018 Draft, both in the first round.

Seattle Mariners News / Seattle Mariners on SI / March 1

Seattle Mariners Trade Acquisition Jackson Kowar Touches 90 MPH-Range in Surgery Recovery

The Seattle Mariners bullpen, a question mark in 2024, is expected to be healthy in 2025. It starts with Matt Brash, but it filters to others as well. Brash, who led Seattle in innings pitched in 2023, is expected to be back in the bullpen by late April or early May barring an unexpected setback.

Seattle Mariners News / Seattle Mariners on SI / February 17

Interesting Seattle Mariners Bullpen Arm Jackson Kowar Working His Way Back

The Seattle Mariners have worked throughout the offseason to retool their bullpen in preparation for 2025. The Mariners traded for several relievers and signed others to minor league deals.

Seattle Mariners News / Fastball on SI / March 10, 2024

Seattle Mariners' Bullpen Candidate to Miss Season with Tommy John Surgery

After being shut down with arm soreness recently, Seattle Mariners' bullpen candidate Jackson Kowar is set to undergo Tommy John surgery. He will miss the entire season and will likely miss some of next year as well.

Seattle Mariners News / MLB Trade Rumors / March 10, 2024

Mariners pitcher to undergo Tommy John surgery

The righty will be out of action until around the midpoint of the 2025 season.

The 35 pitchers who have thrown multiple no-hitters

The '2001 MLB All-Star Game starters' quiz

Seattle Mariners News / Fastball on SI / March 7, 2024

Seattle Mariners' Intriguing Bullpen Arm Seeing Doctor About Problematic Arm Issues

Seattle Mariners' right-hander Jackson Kowar, who has been trying to earn a roster spot in the M's bullpen, is set to see a doctor after reporting some arm discomfort.

MLB News / Yardbarker / December 4, 2023

Braves add intriguing option to the outfield mix in trade with Mariners

After leading the MLB in wins and tying the MLB record for home runs in a season in 2023, the Atlanta Braves added another power bat to the lineup and a veteran left-handed pitcher in a trade with the Seattle Mariners.

Braves land Cy Young winner in trade Jim Bowden wants to see

Which MLB players have the most career WAR?

Atlanta Braves News / SportsTalkATL / November 28, 2023

What do the Braves see in Jackson Kowar?

The Braves shocked the baseball world when they dealt Kyle Wright to the Kansas City Royals ahead of the non-tender deadline. Wright was set to miss the 2024 season after undergoing shoulder surgery, but he was still under contract through 2026 and was projected to earn less than $2 million in arbitration.