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The Seattle Mariners, known for their willingness to trade, are reportedly open to moving Castillo, given his high salary. The proposed trade could involve not only Castillo for prospects like Tristan Casas but also the potential for Boston to engage in the free-agent market for additional offensive reinforcements. The 2023 offseason presents the Red Sox the opportunity to reshape their roster significantly, and they are keenly aware of the need to stay competitive.