Overview
- Multiple outlets reported Saturday that the White Sox agreed to acquire right-hander Luis Castillo from the Seattle Mariners in a trade first broken by ESPN’s Jeff Passan.
- The reported return sends reliever Seranthony Domínguez, outfielder Nolan Jones and catching prospect Boston Smith to Seattle and the clubs had not issued formal confirmations at the time of those reports.
- Chicago is said to be absorbing the remainder of Castillo’s deal, covering roughly $24.2 million in 2026 and 2027 plus a $25 million vesting option for 2028 tied to innings pitched.
- Castillo is a three-time All-Star and a high-innings workhorse who has struggled in 2026 with a 5.06 ERA and a 3-9 record, making the move a calculated gamble on a veteran rebound.
- Seattle, roughly two to three games back of a wild-card spot, traded from rotation depth to add a right-handed reliever, a Major League outfield option and a catching prospect as a roster recalibration that keeps them competitive.