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Earlier this week, I proposed a hypothetical trade that would send Seattle Mariners ace Luis Castillo to the New York Mets in exchange for a loaded prospect haul. The Mets have seen a lot of success from their starting rotation this season, but they could use an ace to place atop it.
Here's the full trade package I proposed:
- Mets receive: RHP Luis Castillo
- Mariners receive: RHP Nolan McLean, UTL Ronny Mauricio

The Mets could use a pitcher like Castillo as they look to win right now and for the next few years. Castillo is under team control through the 2027 season with a vesting option in 2028.
The righty has been very consistent for the Mariners and the Cincinnati Reds during the length of his big league career. Sending him to the Mets would give New York a top pitcher to go head to head with guys like Spencer Strider and Shohei Ohtani in the National League postseason.
The return to Seattle is simple. The Mariners would land top pitching prospect Nolan McLean and utility man Ronny Mauricio.
McLean has dominated the minor leagues since he was drafted a few seasons ago. He has a developed arsenal with one of the best sliders in the minor leagues. In Seattle's system, he could be a star in the making.
Mauricio hasn't played in the big leagues this season as he recovers from an injury, but he's expected to debut in the coming weeks or months. He's a versatile defender with a big league-ready bat that could slot into Seattle's lineup once he's healthy.
The Mets would land their ace, and the Mariners would land two prospects who could help them for the next five or ten years. Seattle would also be dumping quite a lot of money by way of Castillo's contract.
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About the writer
Zach Pressnell is a Newsweek contributor based in Columbus, Ohio. His focus is MLB content. He has an extensive knowledge ... Read more