Cooper Criswell| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 3 | 2 | 1 | 0 | 47.0 | 52 | 15 | 33 | 21 | 3.94 | 1.409 | 9.0 |
| 2026 | 0 | 0 | 1 | 0 | 6.0 | 4 | 1 | 7 | 2 | 3.00 | 0.833 | 48.4 |
| 2025 | 1 | 0 | 1 | 0 | 17.7 | 23 | 5 | 9 | 7 | 3.57 | 1.585 | 4.8 |
| 2024 | 6 | 5 | 0 | 0 | 99.3 | 101 | 31 | 73 | 41 | 3.71 | 1.329 | 25.9 |
| Date | News |
| 3/10/26 | Mariners get solid start from Cooper Criswell in spring training victory. Right-hander Cooper Criswell delivered a solid start for the Mariners in Tuesday's 4-3 Cactus League win over the Royals. Source: https://www.seattletimes.com/sports/mariners/marin... |
| 3/04/26 | Mariners relievers Carlos Vargas, Jose Ferrer struggle in loss to Giants. While Cooper Criswell starred in his first spring start, Mariners relievers Carlos Vargas and Jose A. Ferrer struggled in the team's 9-4 loss to the Giants on Wednesday night. Source: https://www.seattletimes.com/sports/mariners/marin... |
| 1/26/26 | Mariners pick up RHP Criswell in trade with Mets. The Mets traded right-hander Cooper Criswell, who appeared in seven games for Boston last season, to the Mariners in exchange for cash. Source: https://www.espn.com/mlb/story/_/id/47709444/marin... |
| 1/26/26 | Mariners pick up RHP Criswell in trade with Mets. The Mets traded right-hander Cooper Criswell, who appeared in seven games for Boston last season, to the Mariners in exchange for cash. Source: https://www.espn.com/mlb/story/_/id/47709444/marin... |
| 1/25/26 | Mariners pick up RHP Criswell in trade with Mets. The Mets traded right-hander Cooper Criswell, who appeared in seven games for Boston last season, to the Mariners in exchange for cash. Source: https://www.espn.com/mlb/story/_/id/47709444/marin... |
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