Statistics| Year | Team | G | IP | H | K | BB | ER | Win | Sav | Hld | S+H | WHIP | ERA |
|---|
| 2025 | Mariners | 9 | 11.67 | 6 | 9 | 4 | 2 | 1 | 0 | 1 | 1 | 0.857 | 1.54 |
| 2023 | Royals | 23 | 28.00 | 34 | 29 | 20 | 20 | 2 | 0 | 0 | 0 | 1.929 | 6.43 |
| 2022 | Royals | 7 | 15.67 | 27 | 17 | 11 | 17 | 0 | 0 | 2 | 2 | 2.426 | 9.77 |
| 2021 | Royals | 9 | 30.33 | 43 | 29 | 20 | 38 | 0 | 0 | 0 | 0 | 2.077 | 11.27 |
| Total MLB | 48 | 85.67 | 110 | 84 | 55 | 77 | 3 | 0 | 3 | 3 | 1.926 | 8.09 |
| 2025 | Spring | 0 | 0.00 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.00 |
| | 2025 Projections |
|---|
| Source | | G | IP | H | K | BB | ER | Win | Sav | Hld | S+H | WHIP | ERA |
|---|
| Consensus | 27 | 39.53 | 38 | 39 | 18 | 20 | 2 | 0 | 5 | 5 | 1.412 | 4.45 |
| FangraphsDepth | 35 | 35.00 | 33 | 34 | 16 | 17 | 2 | 0 | 0 | 0 | 1.400 | 4.37 |
| RV Current | 17 | 21.21 | 20 | 21 | 9 | 10 | 1 | 0 | 4 | 4 | 1.354 | 4.30 |
| RotoValue | 20 | 19.59 | 19 | 20 | 9 | 10 | 1 | 0 | 4 | 4 | 1.415 | 4.60 |
| Steamer | 35 | 35.00 | 32 | 34 | 15 | 16 | 2 | 0 | 0 | 0 | 1.336 | 4.02 |
| ZiPS | 26 | 64.00 | 62 | 64 | 31 | 33 | 4 | 0 | 0 | 0 | 1.453 | 4.64 |
| modZiPS | 26 | 64.00 | 62 | 64 | 31 | 33 | 4 | 0 | 5 | 5 | 1.453 | 4.64 |
2025 Game Log| July | | Pos | IP | H | K | BB | ER | Win | Sav | Hld | S+H | WHIP | ERA |
|---|
| 2025-07-29 | @ Ath | RP | 2.00 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.00 |
| 2025-07-27 | @ LAA | RP | 1.00 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 2.000 | 0.00 |
| Total | 3.00 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0.667 | 0.00 |
| June | | Pos | IP | H | K | BB | ER | Win | Sav | Hld | S+H | WHIP | ERA |
|---|
| 2025-06-14 | v Cle | RP | 1.00 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0.000 | 0.00 |
| 2025-06-10 | @ Ari | RP | 2.00 | 1 | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 0.500 | 4.50 |
| 2025-06-07 | @ LAA | RP | 0.67 | 1 | 1 | 3 | 1 | 0 | 0 | 0 | 0 | 6.000 | 13.50 |
| 2025-06-06 | @ LAA | RP | 1.00 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | 0.00 |
| 2025-06-03 | v Bal | RP | 2.00 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.00 |
| Total | 6.67 | 3 | 7 | 3 | 2 | 1 | 0 | 0 | 0 | 0.900 | 2.70 |
| May | | Pos | IP | H | K | BB | ER | Win | Sav | Hld | S+H | WHIP | ERA |
|---|
| 2025-05-31 | v Min | RP | 1.00 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1.000 | 0.00 |
| 2025-05-28 | v Wsh | RP | 1.00 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | 0.00 |
| Total | 2.00 | 2 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1.000 | 0.00 |
| | Date | Time | Headline |
|---|
| Sun Mar 10 2024 | 14:54 | Jackson Kowar To Undergo Tommy John Surgery | | Thu Mar 7 2024 | 12:36 | Jackson Kowar To Meet With A Doctor | | Mon Dec 4 2023 | 13:07 | Jackson Kowar, Cole Phillips Heading To Mariners | | Mon Oct 4 2021 | 09:05 | Jackson Kowar Roughed Up In Season Finale | | Mon Sep 27 2021 | 16:56 | Jackson Kowar Gives Up Five Runs In Monday's Loss | | Sun Sep 19 2021 | 19:29 | Jackson Kowar Suffers His Fourth Loss On Sunday | | Wed Sep 15 2021 | 10:25 | Jackson Kowar Lasts Just One Inning On Tuesday | | Thu Sep 2 2021 | 10:34 | Jackson Kowar Pitches Six Strong Innings On Wednesday | | Wed Sep 1 2021 | 09:56 | Jackson Kowar To Start On Wednesday |
| | 2025 Games by Position |
|---|
| RP | 9 |
|---|
| 9 | consecutive relief appearances |
|
|