Jackson Kowar| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 2 | 0 | 0 | 1 | 20.0 | 23 | 12 | 20 | 13 | 6.07 | 1.739 | -2.4 |
| 2025 | 2 | 0 | 0 | 1 | 17.0 | 14 | 7 | 15 | 8 | 4.24 | 1.235 | 4.9 |
| 2023 | 2 | 0 | 0 | 0 | 28.0 | 34 | 20 | 29 | 20 | 6.43 | 1.929 | -7.6 |
| 2022 | 0 | 0 | 0 | 2 | 15.7 | 27 | 11 | 17 | 17 | 9.77 | 2.426 | -15.3 |
| Date | News |
| 7/30/25 | Seattle Mariners Option Veteran Reliever to Make Room For Trade Acquisition. Ferguson reported to Seattle on Wednesday befre the team's series finale against the Athletics at Sutter Health Park in Sacramento, Calif. In a corresponding move, the Mariners optioned right-handed reliever Jackson Kowar to the Triple-A Tacoma Rainiers. ?? Caleb Ferguson (#43), LHP, reports to club. Source: https://www.si.com/mlb/mariners/news/seattle-marin... |
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