White Sox acquired RHP Luis Castillo from the Seattle Mariners in exchange for OF Nolan Jones, RHP Seranthony Dominguez and C/OF Boston Smith.
Castillo is having the worst season of his professional career with a 5.06 ERA and 3-9 record over 20 appearances — 17 starts — and 99 1/3 innings. The 33-year-old right-hander has been much more effective in the past, however, and has pitched better after a dreadful start to his 2026 campaign. Still, this is not the Castillo of old, and he’s much closer to a streamer than someone fantasy managers need to have in their lineup. It’s fair to take a wait-and-see approach before believing in a rebound.