Castillo, 33, is tossing a 5.06 ERA through 99.2 innings with 86 strikeouts this season, a massive downgrade from his previous three seasons of sub-3.70 ERA pitching, including a 2023 All-Star year in which he finished fifth in American League Cy Young voting.
The White Sox will take on the pro-rated portion of his $22.75 million salary this season, all of the $22.75 million next year, and a $25 million vesting option for 2028.
Dominguez, 31, will now be on his fourth team in three years. He's having a solid 2026, posting a 3.99 ERA through 41 games with 12 saves as well. Opponents are batting just .201 off of the vet this season, who also has 47 strikeouts to 28 walks in 38.1 innings with 28 hits given up.
Jones, 28, is slashing .257/.362/.445 with 14 home runs, 59 RBI, and 11 stolen bases through 90 games in Triple-A this season.
Meanwhile, Smith, 23, is slashing .291/.448/.589 with 22 home runs, 58 RBI, and nine stolen bases through 78 combined games in Single-A, High-A, and Double-A ball.
MAJOR LEAGUE BASEBALL
The 2026 MLB Trade Deadline is fast approaching, as teams have until 6:00 p.m. Eastern Time on August 3rd to get any deals done! Follow along with Flashscore as we report on all the trades happening through the weekend.