The trade market for Seattle Mariners pitcher Luis Castillo appears to be shrinking. The Boston Red Sox signed free agent Walker Buehler to a one-year deal, seemingly completing their rotation. The Mets also agreed to a three-year contract with Sean Manaea. While the Mets could still pursue Castillo, Manaea's signing lessens their urgency to acquire him.
The Mariners have maintained they prefer not to trade from their starting rotation, but recognize it might be the only way to acquire top talent at reasonable prices. Castillo, though not an unquestioned ace, is a reliable starter with All-Star caliber qualities. He had an 11-12 record this season, partially due to the Mariners' lackluster offense, but a 3.64 ERA and 30 starts. If the Mariners choose not to trade Castillo, their offseason options become limited. They need to address needs at second base, third base, and find a platoon partner for Luke Raley at first base