Mariners cash in on Castillo, land Dominguez and promising prospects with payroll relief
Seattle traded Luis Castillo to Chicago for reliever Seranthony Dominguez and a prospect package highlighted by Nolan Jones and Boston Smith, plus cash considerations. The move nets the Mariners roughly $18 million in guaranteed salary relief, boosting offseason flexibility, while adding bullpen depth withDominguez, who has a strong track record but a now-troubling sinker. The prospects provide upside as Seattle pivots toward balancing short-term contention with longer-term development.