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Castillo was designated for assignment by the Mets on Friday, Will Sammon of The Athletic reports.
Castillo was just claimed off waivers from Arizona a week ago but will make way for Sean Manaea, whose two-year deal with the Mets is now official. While Castillo has mostly struggled at the highest level, he had a .431 OBP at Triple-A last season, so a team with an opening on its 40-man roster may give him a shot.
