With the Chicago White Sox barely hanging onto a playoff spot, they’re making a significant change to the starting rotation.
White Sox manager Will Venable announced on Thursday that starting pitcher Luis Castillo is moving to the bullpen.
Venable: Luis Castillo moved to bullpen.
— Underdog MLB (@UnderdogMLB)
Castillo with White Sox:
29 IP
7.76 ERA
1.79 WHIP[pic.twitter.com/ESiGzL2hIX][September 17, 2026]
Chicago acquired Castillo from the Seattle Mariners during the MLB trade deadline, and he has struggled immensely. After allowing three runs on four hits and three walks in a bulk-relief outing on September 12 against the St. Louis Cardinals, Castillo has a dismal 7.76 ERA in seven appearances (six starts) and a 1.79 WHIP across just 29 innings.
In what is now his final start of the season, the 33-year-old allowed six earned runs on six hits, with two walks, a home run and just three strikeouts in four innings on September 3 against the Houston Astros. Castillo was set to start Friday against the Detroit Tigers, but David Sandlin will start instead.
Castillo has had a disappointing season overall. In 27 games (23 starts), the righty-hurler is 4-11 with a career-worst 5.67 ERA, 111...