White Sox Acquire Luis Castillo from Mariners in Trade

The Chicago White Sox have acquired right-handed pitcher Luis Castillo from the Seattle Mariners in a trade aimed at bolstering their starting rotation. In exchange, the Mariners receive right-handed reliever Seranthony Domínguez, catching prospect Boston Smith, and outfielder Nolan Jones.

Castillo, who has struggled this season with a 5.06 ERA, is expected to provide much-needed innings for the White Sox, who are currently contending for a playoff spot. The team is absorbing Castillo's contract, which includes over $24 million for next season and a potential $25 million in 2028 if his contract vests.

While the White Sox hope Castillo can improve their rotation, the Mariners are looking to relieve salary and have turned a surplus starter into valuable prospects. This trade reflects Seattle's challenging season as they seek to regroup after underperforming in a weak division.