| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 4 | 4 | 3 | 20 | 56.0 | 49 | 24 | 75 | 19 | 3.00 | 1.315 | 25.2 |
| 2026 | 3 | 0 | 0 | 6 | 15.7 | 8 | 6 | 14 | 1 | 0.57 | 0.894 | 20.0 |
| 2025 | 1 | 3 | 4 | 21 | 47.3 | 41 | 18 | 58 | 13 | 2.47 | 1.246 | 28.1 |
| 2023 | 9 | 4 | 4 | 24 | 70.7 | 64 | 29 | 107 | 24 | 3.06 | 1.316 | 43.4 |
| Date | News |
| 9/04/26 | Mariners rule Matt Brash out for season after injury setback. Mariners general manager Justin Hollander made it official before Friday’s game — Matt Brash won’t pitch again in 2026 after suffering a setback in his injury rehab. Source: https://www.seattletimes.com/sports/mariners/marin... |
| 9/03/26 | Mariners reliever Matt Brash has another setback in recovery: ‘Time is running out’. Any hope of Matt Brash returning to the Mariners bullpen over the final 22 games of the 2026 season might have completely dissipated. "Time is running out." Source: https://www.seattletimes.com/sports/mariners/marin... |
| 8/15/26 | Matt Brash throws off mound for first time, hopeful for September return. Matt Brash threw 15 pitches, all fastballs, in the Houston visitors' bullpen, his first throws off a mound since landing on the IL in June. Source: https://www.seattletimes.com/sports/mariners/matt-... |
| 6/11/26 | Mariners’ Matt Brash will be on injured list ‘a while’ | Notebook. One day after Matt Brash landed on the IL, Mariners manager Dan Wilson acknowledged Matt Brash will be sidelined for much longer than his most recent stint on the IL. Source: https://www.seattletimes.com/sports/mariners/marin... |
| 5/20/26 | Mariners reinstate reliever Matt Brash from injured list. Setup reliever Matt Brash was activated from the 15-day injured list Wednesday morning ahead of the Mariners’ series finale against the White Sox. Source: https://www.seattletimes.com/sports/mariners/marin... |
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