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White Sox's Luis Castillo: Dominant in win over Reds
Rotowire
Castillo (4-9) allowed one hit and two walks while striking out 10 over seven scoreless innings to earn the win over the Reds on Wednesday.
Castillo stumbled with five runs allowed over four innings against the Red Sox in his White Sox debut, but he took advantage of a more favorable matchup in his second start with his new team. The 10 strikeouts were easily a season high for the veteran right-hander. His two longest starts of the year have come against the Reds -- he also tossed seven innings against them in his penultimate start as a Mariner. For the year, Castillo is sporting a 4.96 ERA, 1.35 WHIP and 101:35 K:BB through 110.2 innings over 22 games (19 starts). He's lined up to make his next start on the north side of Chicago against the Cubs next week.
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White Sox's Luis Castillo: Stumbles in White Sox debut
Rotowire
Castillo allowed five runs on six hits and a walk over four innings in a no-decision Thursday against the Red Sox. He struck out five.
After holding Boston hitless through his first two innings, Castillo gave up a two-run homer to Connor Wong in the third before surrendering three runs in the fourth to tie the game at 5-5. It's certainly wasn't the ideal White Sox debut for Castillo, who struggled to a 6.35 ERA across 17 innings in his final three starts with the Mariners before being shipped east at the trade deadline. Through 103.2 innings this year, his ERA sits at 5.30 -- he hasn't finished a season with an ERA above 4.00 since 2018, his first full year in the majors. Castillo will look to turn things around his next time out, tentatively lined up to come at home against the Reds, the team he began his career with in 2017.
Castillo will make his White Sox debut Thursday in Boston, James Fegan of SoxMachine.com reports.
After making his final start for the Mariners on Tuesday before being dealt to the White Sox on Saturday, Castillo will be well-rested and will have some extra time to get acclimated before debuting for his new organization. A three-time All-Star, Castillo brings ample experience to the White Sox rotation, but he submitted a 5.06 ERA and 1.39 WHIP -- both career-worst marks -- over 99.2 innings for the Mariners this season. He's been especially stung by the long ball recently, surrendering seven home runs over his last three outings after giving up just two total in his eight appearances before that.
The White Sox acquired Castillo from the Mariners on Saturday in exchange for right-hander Seranthony Dominguez, outfielder Nolan Jones and catcher Boston Smith, Jeff Passan of ESPN.com reports.
The 31-year-old righty will head to Chicago and bolster a rotation that's received excellent results from Davis Martin and Sean Burke but uneven production from Anthony Kay, Noah Schultz and Erick Fedde at the other three spots. While the three-time All-Star easily becomes the White Sox's most battle-tested starter, Castillo has endured a career-worst 2026 campaign. After submitting a 3.54 ERA and 1.18 WHIP in 32 starts for Seattle a season ago, Castillo turned in a 5.06 ERA and 1.39 WHIP in 20 appearances (17 starts) in 2026 prior to being dealt. Castillo showed signs of righting the ship in May and June, but he went 0-3 with a 5.48 ERA and 1.52 WHIP while serving up seven home runs in 23 innings over four July outings. He last pitched Tuesday, so Castillo could be ready to make his White Sox debut during the team's series in Boston early next week.
Mariners' Luis Castillo: Gives up five runs against Dodgers
Rotowire
Castillo allowed five runs on 11 hits and two walks while striking out two over five innings in a no-decision versus the Dodgers on Tuesday.
Castillo gave up multiple home runs for the third start in a row, as Shohei Ohtani led off the bottom of the first inning with a long ball and Max Muncy went yard in the fifth. This was the first time Castillo had allowed five earned runs since April. July was a rough month for the veteran, who gave up 14 runs over 23 innings across his four outings. On the year, he has a 5.06 ERA, 1.39 WHIP and 86:32 K:BB across 99.2 innings over 20 games (17 starts). Castillo is tentatively projected to make his next start at home versus the Tigers, but that is a loose projection given the likelihood the Mariners move a pitcher before the trade deadline.
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