The Chicago White Sox strengthened their rotation by acquiring right-handed pitcher Luis Castillo from the Seattle Mariners. This four-player trade brings the veteran to Chicago as the team maintains its lead in the American League Central division. The White Sox will also assume the remainder of Castillo's contract, which includes approximately 30 million dollars in guaranteed salary through 2027.
In exchange for Castillo, the Mariners receive right-handed pitcher Seranthony Domínguez, Minor League catcher Boston Smith, and outfielder Nolan Jones. Domínguez, who recorded 12 saves for the White Sox this season, moves to Seattle as part of the deal. The White Sox are positioning themselves for a postseason run while avoiding the trade of their top ten prospects.
Castillo brings playoff experience to the White Sox roster. He has appeared in six career postseason games, including a victory in the deciding game of the 2025 American League Division Series. Chicago's front office continues to monitor the market ahead of the Monday trade deadline, signaling an intent to remain competitive throughout the final months of the regular season.