Mariners deal Castillo to White Sox for Dominguez, Jones, and Smith

The Mariners traded Luis Castillo to the White Sox for reliever Seranthony Dominguez, outfielder Nolan Jones, and catching prospect Boston Smith. Castillo’s extension runs through 2027 with a vesting option for 2028, and Chicago will absorb the remaining deal; Seattle takes on Dominguez’s salary for the next year (with a mutual option for 2028). The move is heavy on depth and salary relief rather than top-end upside, clearing the rotation logjam while giving Chicago a chance to contend in a weak AL Central.