The Seattle Mariners acquired right-handed swingman Cooper Criswell from the New York Mets for cash on January 24, 2026. The Mets had designated Criswell for assignment on January 21 to clear roster space after acquiring Freddy Peralta; Criswell had been claimed off waivers from the Red Sox on December 5.
Browse Mariners and Mets players on AthX
The Move
Criswell, 29, gives Seattle pitching depth as a potential bullpen contributor or spot starter. In 2025 he pitched in seven games (one start) for Boston with a 3.57 ERA in 17⅔ innings. He also made 14 starts and two relief appearances for Triple-A Worcester with a 3.70 ERA in 65⅔ innings. The Mariners designated left-hander Jhonathan Díaz for assignment to make room for Criswell.
AthX Impact
Criswell is a depth arm—his AthX impact is limited unless he earns a larger role in Seattle's bullpen or rotation. The Mariners' bullpen had a 3.72 ERA in 2025, ninth-best in MLB; Criswell adds optionality without moving the needle for star-focused portfolios.
External sources:
Ready to trade? Sign up for AthX and sign up for up to $1000 in FREE Shares!
Ready to trade Mariners Acquire Cooper Criswell from Mets for Cash?
Download the AthX Android app, or sign up on the web. Claim up to $1000 FREE Shares by April 5 (terms apply). Trade player and team shares with low 1–4% fees and performance-linked pricing.
Web signup: https://getathx.com/signup
Double up: referrals + March promo
Refer a friend before April 5 — when they fund with $100+, you can both earn free shares through the referral program, in addition to the limited-time up to $1000 FREE Shares launch offer (terms apply).
Explore AthX trading pages
Browse searchable directories or jump to featured player and team pages (stats, projections, FAQs).