What's Happening?
The Seattle Mariners have acquired right-handed pitcher Cooper Criswell from the New York Mets in exchange for cash considerations. This move comes after Criswell was designated for assignment by the Mets following
their acquisition of Freddy Peralta and Tobias Myers from the Brewers. In a corresponding move, the Mariners designated left-hander Jhonathan Díaz for assignment. Criswell, 29, is known as a serviceable swingman or back-end starter, having had his most extensive major league experience with the Boston Red Sox in 2024. During that season, he pitched 99 1/3 innings over 18 starts and eight relief appearances, maintaining a 4.08 ERA. Despite a solid performance, Criswell was pushed down the depth chart in 2025 due to the Red Sox's acquisitions and returned from injury of key players. He spent most of the 2025 season in Triple-A, where he posted a 3.70 ERA over 65 2/3 innings. Criswell's acquisition adds depth to the Mariners' rotation, which already features a strong starting lineup.
Why It's Important?
This acquisition is significant for the Mariners as it bolsters their pitching depth, a crucial factor for a team aiming to remain competitive in the American League West. The Mariners' rotation is strong, but beyond their top five starters, the depth is less proven. Criswell provides a reliable option who can step in as a starter or long reliever if needed. This move also reflects the Mariners' strategy of maintaining flexibility and readiness to adapt to injuries or performance issues during the season. For the Mets, this transaction helps them manage their roster and financial commitments, allowing them to focus on other strategic areas. The decision to trade Criswell rather than risk losing him through waivers indicates the Mariners' proactive approach to securing talent that can contribute to their success.
What's Next?
The Mariners will need to manage their roster carefully, as their bullpen is currently crowded. They may attempt to pass Criswell or another player through waivers to maintain roster flexibility. Meanwhile, Jhonathan Díaz, who was designated for assignment, will enter a period of uncertainty as the Mariners explore trade options or waiver claims. The Mariners' management will continue to evaluate their pitching staff's performance and make adjustments as necessary to ensure they remain competitive throughout the season. The team's ability to integrate Criswell effectively into their rotation or bullpen will be crucial in maximizing the benefits of this acquisition.
