The Chiba Lotte Marines of Nippon Professional Baseball signed Castillo to a contract Monday, the pitcher's agency, OL Baseball Group, reports.
Castillo bounced around to four different teams during the 2025 regular season, collecting a 3.94 ERA and 30:14 K:BB over 32 innings between the Diamondbacks, Mets, Mariners and Orioles. The left-handed reliever will now try his luck overseas in 2026.