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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

Wed 8/20 Thu 8/21 Fri 8/22
@PHI 1:05 PM EDT --- ATH 10:10 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 6
OPL Roster%
0.00%
OPL Average Salary
$0.00


August 19, 2025 4:09 PM : The Mariners optioned Kowar to Triple-A Tacoma on Tuesday.
Analysis: Kowar had allowed four runs over 2.1 innings covering his last three outings. He'll head to Tacoma for now but could get another opportunity later on this season.

MLB Stats

Pitching

YearTeamGGSIP WINS SV K ERA WHIP
2021KCR9830.1002911.274742.07693
2022KCR7015.200179.765942.42553
2023KCR23028.020296.428571.92857
2025SEA15017.020154.235291.23529

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)16014.012152.571431.35714

Recent Games

Last 10 MLB Games

DateTeamOpponentGSWinSaveHoldIPTBF RERHKBBHBPHR
Aug 18, 2025 SEA @PHI 0 0 0 0 1.0 7 1 1 2 1 2 0 0
Aug 17, 2025 SEA @NYM 0 0 0 0 1.0 5 0 0 1 2 1 0 0
Aug 15, 2025 SEA @NYM 0 0 0 0 0.1 4 3 3 3 1 0 0 1
Aug 14, 2025 SEA @BAL 0 0 0 0 1.0 3 0 0 0 1 0 0 0
Aug 7, 2025 SEA CHW 0 1 0 0 1.0 3 0 0 0 0 0 0 0
Aug 5, 2025 SEA CHW 0 0 0 0 1.0 5 2 2 2 1 0 0 2
Jul 29, 2025 SEA @ATH 0 0 0 0 2.0 6 0 0 0 1 0 0 0
Jul 27, 2025 SEA @LAA 0 0 0 0 1.0 4 0 0 1 0 1 0 0
Jun 14, 2025 SEA CLE 0 1 0 0 1.0 3 0 0 0 1 0 0 0
Jun 10, 2025 SEA @ARI 0 0 0 0 2.0 7 1 1 1 3 0 0 1
Totals 0 2 0 0 11.1 47 7 7 10 11 4 0 4

Last 10 MILB Games

DateLevelTeamOpponentGSWinSave IPTBFRERHKBBHBPHR
Jul 19, 2025 AAA TAC ELP 0 0 0 1.0 3 0 0 0 2 0 0 0
Jul 13, 2025 AAA TAC @RNO 0 0 1 0.1 1 0 0 0 0 0 0 0
Jul 11, 2025 AAA TAC @RNO 0 0 0 1.0 7 2 2 2 2 2 0 0
Jul 8, 2025 AAA TAC @RNO 0 0 0 1.0 5 0 0 1 0 1 0 0
Jul 4, 2025 AAA TAC @SL 0 0 0 1.0 3 0 0 0 3 0 0 0
Jul 1, 2025 AAA TAC SL 0 0 0 1.0 5 0 0 0 0 1 1 0
Jun 28, 2025 AAA TAC @RR 0 0 0 0.2 6 4 1 1 1 2 0 0
Jun 21, 2025 AAA TAC ABQ 0 0 0 1.0 4 0 0 0 1 1 0 0
Jun 19, 2025 AAA TAC ABQ 0 0 1 1.0 4 0 0 1 2 0 0 0
Jun 17, 2025 AAA TAC ABQ 0 0 0 1.0 3 0 0 0 1 0 0 0
Totals 0 0 2 9.0 41 6 3 5 12 7 1 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
May 31, 2021 2:45 PM add This team available $2
June 12, 2021 5:46 PM cut This team available $1
July 3, 2021 6:42 PM add 5TOOLERS $1
October 9, 2021 4:37 AM increase 5TOOLERS $3
December 18, 2021 8:32 AM move Johnny Bench's old catcher's mitt (from 5TOOLERS) $3
February 15, 2022 10:45 PM cut Johnny Bench's old catcher's mitt $0

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 ST RP L $4 
Anthony Bender MIA RP R $3 15IL 
Jackson Kowar KCR RP R $3 
Josiah Gray WSN SP/RP R $5 60IL 
Nick Lodolo CIN SP L $3 15IL 
 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 
Joey Wendle TBR 2B L $6
December 17, 2021 8:31 AM Johnny Bench's old catcher's mitt Dane Dunning TEX 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 1B/3B R $3
Jackson Kowar KCR RP R $3 
 Joebuckyourself Hunter Renfroe BOS OF R $4
July 29, 2021 4:56 AM Judge and Drury IV Tanner Houck BOS SP R $1 60IL 
Ranger Suarez PHI SP L $2 
 Joebuckyourself Josh Bell WSN 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/SS/3B/OF R $1 
Nick Solak PIT AAA 1B/OF R $8
Juan Soto WSN OF L $67 
Evan White LAA AA Util R $1 MILB 60IL
Isaac Paredes DET 1B/3B R $1 60IL
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 
Dominic Smith NYM 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 KCR 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
Adalberto Mondesi KCR Util S $25
Brennen Davis NYY AAA 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 10IL 
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
Tyler Rogers SFG RP R $1
June 9, 2021 2:20 PM Prognosis Negative Brendan Rodgers COL 2B R $1 60IL 
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 
$53 loan 		Coop Singles to Left Tony Gonsolin LAD SP R $4 60IL
Jackson Kowar KCR RP R $3