Cleveland meetup, June 12 | Seattle meetup, June 14

Jackson Kowar SEA RP R 

Born: 10/04/1996 Age: 28

FanGraphs Player Page

2025 OPL OPL Player Page

On MLB 40-man: YES
Acquired: Trade (ATL) Dec'23

Sat 5/31 Sun 6/01 Mon 6/02
MIN 7:15 PM EDT MIN 4:10 PM EDT ---

Positions
RP
2026 Earned Positions
RP

All Leagues
Average $0.00 Median $0.00
Old School (5x5)
Average $0.00 Median $0.00

All Leagues
Average $1.00 Median $1.00
Old School (5x5)
Average $2.10 Median $2.00

Roster%
0%
Change
7Day 0%
30Day 0%

2025 OPL 2025 OPL Round 2
OPL Roster%
0.00%
OPL Average Salary
$0.00


May 28, 2025 6:09 PM : The Mariners reinstated Kowar (elbow) from the 60-day injured list Wednesday.
Analysis: Kowar will return to the majors after missing the entire 2024 season following Tommy John surgery last March. The 28-year-old right hander posted a 2.57 ERA and 1.29 WHIP across seven innings during his rehab assignment and did not yield a run in each of his last three outings. Kowar will be available to make his 2025 debut out of the Mariners' bullpen against the Nationals on Wednesday. Logan Evans was optioned to Triple-A Tacoma in a corresponding move.

MLB Stats

Pitching

YearTeamGGSIP WINS SV K ERA WHIP
2021KCR9830.1002911.274742.07693
2022KCR7015.200179.765942.42553
2023KCR23028.020296.428571.92857
2025SEA101.00010.000001.00000

MILB Stats

Pitching

YearTeamGGSIP WINS SV K ERA WHIP
2018KCR (A)9926.100223.417721.17722
2019KCR (A+)131374.050663.527031.21622
2019KCR (AA)131374.120783.511211.26457
2021KCR (AAA)171680.2901153.458681.23967
2022KCR (AAA)202083.140886.156001.65600
2023KCR (AAA)30145.122495.955881.83088
2025SEA (CPX)222.00014.500001.00000
2025SEA (AAA)605.01031.800001.40000

Recent Games

Last 10 MLB Games

DateTeamOpponentGSWinSaveHoldIPTBF RERHKBBHBPHR
May 28, 2025 SEA WSN 0 0 0 0 1.0 4 0 0 1 1 0 0 0
Sep 27, 2023 KCR @DET 0 0 0 0 1.2 9 2 2 2 1 2 0 1
Sep 26, 2023 KCR @DET 0 0 0 0 0.1 3 1 1 2 0 1 0 0
Sep 22, 2023 KCR @HOU 0 0 0 0 0.1 5 3 3 3 0 1 0 1
Sep 18, 2023 KCR CLE 0 1 0 0 1.0 4 0 0 1 2 0 0 0
Sep 17, 2023 KCR HOU 0 0 0 0 1.0 3 0 0 0 1 0 0 0
Sep 12, 2023 KCR @CHW 0 0 0 0 1.2 6 0 0 0 2 1 0 0
Sep 10, 2023 KCR @TOR 0 0 0 0 0.2 4 0 0 2 0 0 0 0
Sep 5, 2023 KCR CHW 0 1 0 0 1.0 3 0 0 0 1 0 0 0
Sep 2, 2023 KCR BOS 0 0 0 0 2.0 10 1 1 3 2 1 0 0
Totals 0 2 0 0 10.2 51 7 7 14 10 6 0 2

Last 10 MILB Games

DateLevelTeamOpponentGSWinSave IPTBFRERHKBBHBPHR
May 24, 2025 AAA TAC @ELP 0 0 0 1.0 3 0 0 0 0 0 0 0
May 22, 2025 AAA TAC @ELP 0 0 0 0.1 2 0 0 1 0 0 0 0
May 20, 2025 AAA TAC @ELP 0 1 0 1.0 5 0 0 1 0 1 0 0
May 17, 2025 AAA TAC @ABQ 0 0 0 0.2 5 1 1 2 2 1 0 0
May 14, 2025 AAA TAC @ABQ 0 0 0 1.0 5 0 0 0 1 1 1 0
May 10, 2025 AAA TAC SAC 0 0 0 1.0 3 0 0 0 0 0 0 0
May 6, 2025 CPX A-MRN A-BRW 1 0 0 1.0 3 0 0 0 0 0 0 0
May 3, 2025 CPX A-MRN @A-ROY 1 0 0 1.0 6 2 1 2 1 0 0 0
Aug 15, 2023 AAA OMA @TOL 0 0 0 1.0 5 1 1 2 1 0 0 0
Aug 12, 2023 AAA OMA IOW 0 0 0 2.2 11 0 0 2 3 0 1 0
Totals 2 1 0 10.2 48 4 3 10 8 3 2 0

Avg Salary & Roster%

Last 30 days

2026 Position Eligibility Progress

To gain eligibility, a player must have 5 GS or 10 G at a position in the majors, or 20 G at a position in the minors.

Transaction History

Date Transaction Type Team Salary
June 1, 2021 11:55 AM add Clown Prince $3
June 13, 2021 3:55 PM move Charlie Hustle (from Clown Prince) $3
June 26, 2021 11:25 AM cut Charlie Hustle $2
July 21, 2021 3:46 PM add Dansby's Swan Song $2
July 21, 2021 4:05 PM cut Dansby's Swan Song $1

Recent Trades for Jackson Kowar in Old School (5x5)

Date Proposing Team Proposing Team Gives Accepting Team Accepting Team Gives
December 22, 2021 12:37 AM Jacksonville Jimbo Shrimp Jose Alvarado PHI RP L $4 SUSP
Anthony Bender MIA RP R $3
Jackson Kowar KCR RP R $3 
Josiah Gray WSN SP/RP R $5 60IL
Nick Lodolo CIN SP L $3 
 All Proofs Carlos Santana KCR 1B S $20 
Max Kepler MIN OF L $20 
Kyle Hendricks CHC SP/RP R $20 
Blake Snell SDP SP L $41 60IL
Joey Wendle MIA 2B L $6
December 17, 2021 8:31 AM Johnny Bench's old catcher's mitt Dane Dunning TEX AAA SP/RP R $6
 5TOOLERS Jackson Kowar KCR RP R $3 
December 3, 2021 7:20 AM Judge and Drury IV Carter Kieboom LAA AAA 3B R $3
Jackson Kowar KCR RP R $3 
 Joebuckyourself Hunter Renfroe MIL OF R $4 
July 29, 2021 4:56 AM Judge and Drury IV Tanner Houck BOS SP R $1 15IL 
Ranger Suarez PHI SP L $2 
 Joebuckyourself Josh Bell PIT 1B S $9 
Jackson Kowar KCR RP R $1 
$7 loan
July 12, 2021 10:58 AM Zombie Ghost Sharks Miguel Sano MIN 3B R $8
Mauricio Dubon SFG 1B/2B/3B/OF R $1 
Nick Solak TEX OF R $8
Juan Soto WSN OF L $67 
Evan White LAA AA Util R $1 7IL
Isaac Paredes DET 1B/3B R $1
Jackson Kowar KCR RP R $1 
Garrett Crochet CHW SP L $5 
 My Passion is My Hobby Hansel Robles LAD AAA RP R $1
Tyler Glasnow TBR SP R $16 60IL 
Dominic Smith NYY AAA 1B/OF L $11
Luis Urias MIL 2B/3B R $1
Ronald Acuña Jr. ATL OF R $65 
Nate Pearson CHC AAA RP R $3
$6 loan
June 26, 2021 12:57 PM Freddie Got Fingered Jose Abreu CHW 1B R $28
Bobby Dalbec MIL AAA 1B/3B/OF R $9
Aaron Bummer CHW RP L $5
Jackson Kowar KCR RP R $1 
$2 loan 		Jacksonville Jimbo Shrimp Eric Hosmer SDP Util L $7
Frankie Montas OAK SP R $6 60IL 
Adalberto Mondesi KCR Util S $25
Brennen Davis NYY AA OF R $3
June 14, 2021 6:00 PM Slob on my KNOBLAUCH Jackson Kowar KCR RP R $2 
 VINSCULLLYismyhomeboy Jordan Hicks STL SP/RP R $3
June 12, 2021 3:54 PM Clown Prince Jorge Soler KCR OF R $8 
Chris Martin ATL RP R $1 15IL 
Jackson Kowar KCR RP R $3 
Jarren Duran BOS OF L $1 
 Charlie Hustle Mitch Haniger SEA OF R $9 OUT
Tyler Rogers SFG RP R $1
June 9, 2021 2:20 PM Prognosis Negative Brendan Rodgers COL 2B R $1
Daulton Jefferies PIT AAA SP/RP R $1
Jackson Kowar KCR RP R $1 
 Prestige Worldwide Diego Castillo COL AAA RP R $7
$4 loan
June 7, 2021 7:24 AM Sixto Midnight Aroldis Chapman NYY RP L $26 
Blake Snell SDP SP L $34 60IL
$53 loan 		Coop Singles to Left Tony Gonsolin LAD SP R $4 
Jackson Kowar KCR RP R $3