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SEATTLE — The Seattle Mariners acquired right-hander Cooper Criswell from the New York Mets on Friday for cash, and designated left-hander Jhonathan Diaz for assignment.
Criswell, 29, appeared in seven games for Boston last season, going 1-0 with a 3.57 ERA. He was claimed off waivers by the New York Mets on Dec. 5 and designated for assignment Wednesday.
Diaz, 29, appeared in one game with the Mariners in 2025. He was 11-6 in 27 games with Triple-A Tacoma and led the Pacific Coast League with a 4.15 ERA.
