Mariners Trade for Cooper Criswell: Full Breakdown & Analysis (2026)

The Mariners are shaking up their pitching staff! In a recent move, they acquired a promising young pitcher, right-hander Cooper Criswell, from the New York Mets, sending cash in return. But that's not all; they also made a tough decision by designating left-handed pitcher Jhonathan Diaz for assignment.

A new arm for Seattle: Criswell, aged 29, had a brief but impressive stint with the Boston team last season, appearing in seven games with a 1-0 record and a 3.57 ERA. He was recently claimed by the Mets but didn't stay long, leading to this trade. But here's where it gets intriguing: Criswell's journey has been a rollercoaster, having been waived and designated for assignment multiple times in a short period. This raises the question: Is he a hidden gem or a risky acquisition?

A tough goodbye: As for Diaz, his time with the Mariners was brief but impactful. In his single appearance with the team in 2025, he showcased his talent. At the Triple-A Tacoma level, he dominated with an 11-6 record and led the Pacific Coast League with a 4.15 ERA. Now, his future with the Mariners is uncertain, leaving fans curious about the team's plans.

This move by the Mariners is a strategic gamble, sparking debates among fans and analysts. Is Criswell the missing piece for their pitching puzzle, or will Diaz's departure leave a gap? What do you think? Share your thoughts on this trade and its potential impact on the team's future.

Mariners Trade for Cooper Criswell: Full Breakdown & Analysis (2026)

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