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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

Tue 7/29 Wed 7/30 Thu 7/31
@ATH 10:05 PM EDT @ATH 10:05 PM EDT TEX 9:40 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 5
OPL Roster%
0.00%
OPL Average Salary
$0.00


July 24, 2025 1:54 PM : The Mariners recalled Kowar from Triple-A Tacoma on Thursday.
Analysis: Since being optioned to Triple-A in mid-June, Kowar has given up six runs (three earned) over nine innings while striking out 12 batters and walking seven. He owns a 2.08 ERA through 8.2 frames with the Mariners this year, but his career 8.38 ERA will keep him limited to a low-leverage role in Seattle's bullpen. Brandyn Garcia was optioned to 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
2025SEA809.21081.862071.03448

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
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
Jun 7, 2025 SEA @LAA 0 0 0 0 0.2 6 1 1 1 1 3 0 0
Jun 6, 2025 SEA @LAA 0 0 0 0 1.0 4 0 0 1 1 0 0 0
Jun 3, 2025 SEA BAL 0 0 0 0 2.0 6 0 0 0 1 0 0 0
May 31, 2025 SEA MIN 0 0 0 1 1.0 4 0 0 1 0 0 1 0
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
Totals 0 1 0 1 11.2 50 5 5 10 9 7 1 2

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 20, 2021 3:04 PM add Joebuckyourself $1
July 30, 2021 4:57 AM move Judge and Drury IV (from Joebuckyourself) $1
October 9, 2021 4:42 AM increase Judge and Drury IV $3
December 4, 2021 7:21 AM move Joebuckyourself (from Judge and Drury IV) $3
March 9, 2022 3:38 PM cut Joebuckyourself $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 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 CHW 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 AAA 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/SS/3B/OF R $1 
Nick Solak PIT AAA OF R $8
Juan Soto WSN OF L $67 
Evan White LAA AA Util R $1 7IL
Isaac Paredes DET 1B/3B R $1 10IL 
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 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 
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 60IL 
$53 loan 		Coop Singles to Left Tony Gonsolin LAD SP R $4 60IL 
Jackson Kowar KCR RP R $3