The White Sox need their biggest trade deadline acquisition to deliver a strong performance and help them salvage a win at Fenway Park.
On Thursday night in Boston, Chicago White Sox fans will get their first look at newly acquired starting pitcher Luis Castillo. He will make his White Sox debut at Fenway Park after being dealt by the Seattle Mariners prior to the trade deadline.
And the White Sox need him now more than ever.
The White Sox are 0-5 against the Boston Red Sox this season, and they have been outscored 33-4 in those games. The week following the trade deadline is always massive for building momentum. It is an opportunity to inject your team with energy for the home stretch and reestablish some dominance at the top of the division.
The White Sox have failed to do that. They have been completely outclassed by Boston in every facet of the game over the last two days. But escaping Fenway Park with at least one win would go a long way toward getting the White Sox back on track before a massive series with the Cleveland Guardians this weekend.
Chicago has been fortunate enough to hold serve in the AL Central despite getting blown out by the Red Sox. Both the Guardians and Minnesota Twins have lost their last two games as well. As a result, Chicago's lead in the AL Central remains 3.0 games over Cleveland and 4.0 games over Minnesota. The Detroit Tigers are 4.5 games back.
With a win on Thursday night, there is no real harm done from the series in Boston. The White Sox might even gain a game. They would head into the weekend still viewed as the clear favorite in the division, while chalking up their struggles against Boston to nothing more than facing a team they do not match up with well.
And it's Castillo taking the ball with an opportunity to provide the White Sox with a spark in a big game.
Which version of Luis Castillo are the White Sox going to get? That's the question on everybody's mind.
Castillo is a 10 year MLB veteran who posted a 3.55 ERA across 243 starts from 2017 through 2025. He has been a model of consistency throughout his career and has been selected to three All Star teams. He has also pitched in some big postseason games for the Mariners.
But in 2026, Castillo has a 5.06 ERA. His WHIP is also the worst of his career, and we have not seen him be the same workhorse he was known for being with the Mariners.
The White Sox clearly see something in Castillo that they believe can be fixed. They think there is more left in the tank. That is why they were willing to take on his salary, bringing him in for the remainder of 2026 while maintaining club control over him for 2027. Castillo's 3.88 ERA over his last 10 starts undoubtedly has something to do with that belief.
I don't think it is realistic to expect Castillo to return to his All Star form for the remainder of the 2026 season. But if he can pitch close to the level he has shown while posting a 3.88 ERA over his last 10 starts, the White Sox would be very happy.
If there is one game he is going to dominate, though, let it be Thursday night against Boston. With reliable left hander Ranger Suárez on the mound for the Red Sox, it feels like Chicago's best chance of salvaging a game is to receive a dominant performance from Castillo.
Castillo faced the Red Sox with Seattle on June 19 and allowed four earned runs over four innings. But that appearance came out of the bullpen in relief of Bryce Miller.
Thursday is a big night for the White Sox. It's a big game that could bring some positivity back to the fan base, and their biggest trade deadline acquisition will be on the mound with an opportunity to deliver exactly what his new team needs.
