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Chicago White Sox acquire pitcher Luis Castillo from Mariners

PUBLISHED Aug 1, 2026, 11:09 PM ET

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The Chicago White Sox are acquiring right-handed starter Luis Castillo from the Seattle Mariners in a multi-player trade, according to sources cited by ESPN’s Jeff Passan. Seattle will receive reliever Seranthony Dominguez, outfielder Nolan Jones and catching prospect Boston Smith. Castillo, 33, is 3-9 with a 5.06 ERA over 17 starts this season, allowing 107 hits in 99⅔ innings, but holds a 3.65 ERA across 10 MLB seasons. The trade, reported this week, gives Chicago an experienced rotation arm while Seattle adds bullpen depth and position-player assets.

By Lauren Mitchell | JQJO News

Timeline of Events

On July 25 2022 Luis Castillo joined Seattle Mariners roster.
On November 15 2022 Luis Castillo signed a contract extension.
On April 5 2026 Luis Castillo started the regular season.
On July 15 2026 Seattle evaluated surplus starting pitching options.
On August 1 2026 ESPN reported the blockbuster trade agreement.
On August 2 2026 Chicago White Sox officially announced acquisition.
On August 10 2026 Luis Castillo will debut for Chicago.
On September 15 2026 Chicago contends in postseason playoff races.
On October 20 2026 Luis Castillo pitches in autumn postseason.
On November 1 2027 Luis Castillo completes his contract season.

News Intelligence

Chicago White Sox acquire veteran starting pitching for playoff push.
Seattle Mariners clear starting rotation logjam and secure prospect depth.
Chicago White Sox fans and Seattle Mariners franchise management teams.
Official Major League Baseball transaction announcements and verified journalism reports.

Media Bias

Articles Published:: 11
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Left Leaning:: 0
Neutral:: 11

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Coverage highlights labor dynamics, roster economics, and community player impact. Reports focus strictly on transaction mechanics, statistics, and roster updates. Analyses emphasize competitive excellence, executive leadership vision, and market strategy.