Overview
- The Marines announced the signing on December 1, confirming Castillo’s move to Japan for the upcoming season.
- New York non-tendered Castillo ahead of the deadline, passing on a projected $1.7 million arbitration salary.
- Castillo logged a 3.94 ERA over 32 innings in 2025 across the Diamondbacks, Mets, Mariners, and Orioles, including a 2.35 ERA in 16 outings with New York.
- Being out of minor-league options made him a frequent DFA and waiver claim in 2025, fueling his search for a steadier role.
- At 29 and turning 30 in January, he seeks a guaranteed deal and a reset in NPB with an eye toward a possible MLB return.