June 29, 2025 10:54 AM : The Orioles designated Castillo (undisclosed) for assignment Sunday.
Analysis: Shortly after the Orioles claimed him off waivers from the Mariners on May 7, Castillo was placed on Triple-A Norfolk's 7-day injured list due to an unspecified injury. He made pair of rehab starts in the rookie-level Florida Complex League earlier this month and was reinstated from Norfolk's IL on Sunday, only to be simultaneously removed from the Orioles' 40-man roster to make room for Matt Bowman.