Mariners deal Luis Castillo to Chicago in multi-piece swap
Seattle sends ace starter Luis Castillo to the White Sox and receives a reliever, two minor leaguers, and cash in return.
The Seattle Mariners have officially traded RHP Luis Castillo to the Chicago White Sox. In return, Seattle receives RHP Seranthony Domínguez, minor league catcher Boston Smith, minor league outfielder Nolan Jones, and cash considerations. The deal was announced directly by the Mariners' official club account, confirming it as completed. This represents a significant rotation change for Seattle and an addition of bullpen depth via Domínguez.
More on the Mariners wire.
Mariners Underperforming After High Preseason Expectations
Seattle entered 2025 as a popular World Series pick but has struggled badly, raising questions about what went wrong for the club.
Mariners Slide to Seven Games Under .500 After ALCS Run
Seattle's surprising fall from ALCS contender to struggling club has the team fighting to stay relevant in a weak AL West.
Mariners Manager Dan Wilson Ejected After Ump Dispute Involving Julio
Seattle skipper Dan Wilson was tossed from the game after arguing with the home plate umpire who denied a challenge related to Julio Rodriguez.
Gabe Speier's Suspension Reduced to 2 Games, Will Return Tuesday
Seattle Mariners reliever Gabe Speier's suspension has been reduced and he will return to play on Tuesday.
Kirby at 99 Pitches Through 5 Innings vs. Rays
High pitch count driven by 25 foul balls suggests Kirby is unlikely to pitch deep into the game against Tampa Bay.
Luke Raley Done for 2026 After Flexor Tendon Surgery
The Mariners outfielder will have surgery to repair his left forearm flexor tendon, ending his 2026 season. He expects to be ready for spring 2027.