Mariners Trade: Cooper Criswell Joins Seattle from New York Mets | MLB News (2026)

The Seattle Mariners just made a surprising move that has the baseball world talking. In a recent deal, they acquired right-handed pitcher Cooper Criswell from the New York Mets in exchange for cash considerations. But here's where it gets interesting: they also designated lefty Jhonathan Diaz for assignment, sparking debates among fans and analysts alike.

Criswell, a 29-year-old pitcher, had a brief stint with the Boston team last season, showcasing his talent in seven games and maintaining a solid 3.57 ERA. He was recently claimed by the Mets but didn't stay long, as they designated him for assignment just a few weeks later. And this is the part most fans are curious about: why the quick turnaround?

As for Diaz, also 29, he had a single appearance with the Mariners in 2025, but his success in the minor leagues is notable. With an impressive 11-6 record and a league-leading 4.15 ERA in Triple-A Tacoma, he seemed to be on the rise. So, the question remains: why let go of a promising left-hander?

This trade leaves many wondering about the Mariners' strategy. Is it a calculated risk or a hasty decision? Only time will tell if this move will pay off for Seattle. What do you think about this trade? Was it a smart move, or did the Mariners give up too much? Share your thoughts in the comments below!

Mariners Trade: Cooper Criswell Joins Seattle from New York Mets | MLB News (2026)

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