White Sox acquire Luis Castillo from Mariners in major trade

In a recent trade, the Chicago White Sox acquired pitcher Luis Castillo from the Seattle Mariners. The deal involved sending pitcher Seranthony Dominguez, outfielder Nolan Jones, and prospect Boston Smith to Seattle. Castillo has struggled this season with a 3-9 record and a 5.06 ERA, but he has a strong history as a three-time All-Star. The White Sox hope that this trade will help improve their starting pitching and enhance their chances of making the playoffs.

White Sox acquire Luis Castillo from Mariners in major trade
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sport Published Aug 2, 2026

Topic overview

In brief

  • The Chicago White Sox have traded for pitcher Luis Castillo from the Seattle Mariners.
  • In exchange, the White Sox sent pitcher Seranthony Dominguez, outfielder Nolan Jones, and prospect Boston Smith to the Mariners.
  • Castillo's acquisition is seen as a crucial move to strengthen the White Sox's starting rotation as they aim for the playoffs.

Summary

In a significant move for the Chicago White Sox, the team has acquired pitcher Luis Castillo from the Seattle Mariners. This trade, reported by ESPN's Jeff Passan, involved the White Sox sending pitcher Seranthony Dominguez, outfielder Nolan Jones, and prospect Boston Smith to the Mariners in exchange for Castillo. The trade comes as the White Sox have been struggling with their starting pitching and are looking to bolster their roster as they aim for a playoff spot. Castillo, a three-time All-Star, has had a challenging season with a 3-9 record and a 5.06 ERA, but he has a history of success, having maintained an ERA under 4.00 in eight of his previous nine seasons. The White Sox are hopeful that this fresh start will allow Castillo to regain his elite form and make a significant impact on their pitching staff. With a career record of 87-93, a 3.65 ERA, and 1,579 strikeouts over 263 major league games, Castillo's potential to contribute to the White Sox's success is considerable. The team has been in dire need of starting pitching help, and Castillo's arrival could be a turning point for their season as they strive to improve their standings in the AL Central division.

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Updated Aug 2, 2026

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