| 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 | 21.5 |
| 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 |
| 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... |
| 5/01/26 | Here’s the latest injury update on Mariners’ Matt Brash | Notebook. The Mariners got "very good news" about Matt Brash's injury. But the reliever is still landing on the injured list. Here's the latest. Source: https://www.seattletimes.com/sports/mariners/heres... |
| 4/29/26 | Matt Brash leaves Mariners game with discomfort: Here’s what we know. Mariners reliever Matt Brash left Wednesday's game after throwing two pitches with discomfort in his side. "I couldn't really get my arm into the spot that I needed to," he said. Source: https://www.seattletimes.com/sports/mariners/matt-... |
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