| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 1 | 2 | 20 | 5 | 58.0 | 30 | 24 | 93 | 17 | 2.69 | 0.919 | 45.0 |
| 2026 | 1 | 1 | 15 | 0 | 22.7 | 10 | 9 | 45 | 2 | 0.79 | 0.838 | 116.3 |
| 2025 | 1 | 2 | 22 | 10 | 61.7 | 28 | 28 | 104 | 18 | 2.63 | 0.908 | 59.9 |
| 2024 | 2 | 2 | 28 | 0 | 65.0 | 35 | 21 | 104 | 18 | 2.49 | 0.862 | 70.7 |
| Date | News |
| 5/21/26 | How Mason Miller is (somehow) getting even better. No content provided Source: https://www.mlb.com/news/mason-miller-improving-fo... |
| 5/15/26 | [Sporting News] - Athletics have an ironic trade deadline need thanks to a Mason Miller problem. This is an ironic need for the A's in 2026. Source: https://sportspyder.com/mlb/oakland-athletics/arti... |
| 5/12/26 | Mason Miller debuts crazy, Force-aided pitch ... with Grogu's help!. No content provided Source: https://www.mlb.com/news/mason-miller-pitches-with... |
| 5/06/26 | [Sporting News] - Padres' ideal trade chip is outcast from Mason Miller Athletics deal. San Diego doesn't seem to have much trust in the left-hander. Source: https://sportspyder.com/mlb/oakland-athletics/arti... |
| 4/30/26 | [Fan Nation] - A's Bullpen Ranks Second in MLB Since Trading Mason Miller to Padres. The A's moved one of the game's top closers for one of its top prospects at last year's deadline. The numbers say it's paying off. Source: https://sportspyder.com/mlb/oakland-athletics/arti... |
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