MLB Jersey Numbers on X: RHP Luis Castillo will wear number 21. Last worn by OF Steven Souza, Jr. earlier this season. #Mariners / X

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Seattle Mariners on X: Adding another ace. We've acquired All-Star RHP Luis Castillo from the Reds in exchange for IF Noelvi Marte, IF Edwin Arroyo, RHP Levi Stoudt and RHP Andrew Moore.

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Luis Castillo dominates, Ty France plays hero in Mariners' season-opening win over Guardians

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