White Sox turn to Luis Castillo as rebuild meets surging Red Sox at Fenway
Seeking to rebound from a 60–102 season, Chicago added veteran pitcher Luis Castillo at the trade deadline before heading into a bruising series against a red-hot Boston Red Sox.
The Chicago White Sox acquired veteran right-handed pitcher Luis Castillo from the Seattle Mariners at the trade deadline, according to reports. Castillo was scheduled to make his White Sox debut against the Boston Red Sox at Fenway Park as Chicago tried to avoid another series sweep.
The Chicago White Sox acquired veteran right-hander Luis Castillo from the Seattle Mariners at the trade deadline, and he was scheduled to make his debut for the club on Thursday against the Boston Red Sox at Fenway Park, according to reports. Chicago designated outfielder Austin Hays for assignment as general manager Chris Getz reshaped the roster, with Getz later explaining the steps behind one of the club's deadline deals. The 2026 season is the White Sox's 127th in Chicago, their 126th in the American League and their 36th at Rate Field on the South Side. The club entered the year trying to rebound from a 60–102 finish, and the deadline moves signalled that the rebuild remains very much in progress. The timing made for a stern test. Boston had won nine of its previous ten games and 25 of 28, according to reports, and beat the White Sox 4–0 on Wednesday while chasing a third consecutive series sweep. Castillo's arrival, and how he fares against that lineup, offers an early read on whether Getz's deadline work can steady a struggling club.
A rebuilding season on the South Side
The 2026 season marks the Chicago White Sox's 127th in Chicago, their 126th as a member of the American League, and their 36th playing at Rate Field on the city's South Side. The club competes in the American League Central Division and remains one of two Major League Baseball teams calling Chicago home, sharing the market with the National League's Cubs.
The White Sox entered the year looking to move past a difficult 2025 campaign, in which they finished 60–102. That record left the organisation in a clear rebuilding posture, with the front office under pressure to show progress on the field while reshaping the roster for the seasons ahead. How the team responded to that 102-loss finish has framed much of the conversation around the club this year.
Castillo arrives as Getz reshapes the roster at the deadline
The White Sox made one of the more notable moves of the trade deadline, acquiring veteran right-handed pitcher Luis Castillo from the Seattle Mariners, according to reports. Castillo, an established arm with years of major league experience, gives Chicago a proven presence in a rotation that has struggled through a difficult campaign.
General manager Chris Getz later explained the steps involved in completing one of the club's deadline deals, offering a window into how the front office navigated a hectic stretch of negotiations, reports said. The full details of what Chicago sent to Seattle in the Castillo trade have not been disclosed.
The deadline activity also forced a roster decision. Following the flurry of moves, the White Sox designated outfielder Austin Hays for assignment, according to reports, clearing space as the reshaped roster took form. What comes next for Hays remains unclear.
A daunting test at Fenway against a surging Red Sox
The White Sox arrived at Fenway Park to face one of the hottest teams in baseball. According to reports, Boston had won nine of its previous ten games and 25 of its last 28 entering the series, and the Red Sox extended that run with a 4–0 victory over Chicago on Wednesday.
That game also cost Boston its first baseman. Willson Contreras exited in the fourth inning due to illness, reports said, and the Red Sox announced a decision on the All-Star ahead of Thursday's series finale. Contreras was left out of the lineup, with Nick Sogard set to play first base and Caleb Durbin slated to bat cleanup, according to reports.
Chicago, meanwhile, was trying to avoid another series sweep. Reports indicated the Red Sox could complete a third consecutive sweep with a win on Thursday. The White Sox planned to counter with Luis Castillo, who was scheduled to make his debut for the club on the Fenway mound. Covers.com analysts predicted Boston's pitching advantage would decide the game.
The White Sox began their 127th season in Chicago, their 126th in the American League and 36th at Rate Field, looking to rebound from a 60–102 finish the year before.
Chicago acquired veteran right-hander Luis Castillo from the Seattle Mariners, a deal general manager Chris Getz later described the steps behind.
Following a busy trade deadline, the White Sox designated outfielder Austin Hays for assignment.
Boston beat the White Sox 4–0, and Willson Contreras left the game in the fourth inning because of illness.
Ahead of the series finale at Fenway Park, Boston left Contreras out of the lineup, planned to start Nick Sogard at first base and bat Caleb Durbin cleanup, and announced a decision on Contreras.
Luis Castillo was scheduled to make his White Sox debut against Boston as Chicago tried to avoid another sweep, with the Red Sox seeking a third consecutive series sweep.
Boston, which had won nine of its previous ten games and 25 of 28, signed a pitcher with nine years of MLB experience during the series, while Covers.com analysts expected Boston's pitching edge to be
Cleveland opened a six-game road trip with a series in Chicago, and experts revised predictions and odds for the Guardians–White Sox game after a market shift tied to Kyle Manzardo.
Guardians visit next as the schedule rolls on
The White Sox's schedule offered little respite after Boston. According to reports, the Cleveland Guardians opened a six-game road trip to Chicago and Detroit with a three-game series on the South Side, beginning Friday, August 7. Experts revised their predictions and odds for that game following a market change involving Cleveland's Kyle Manzardo, according to covers.com.
Much remains unsettled. The outcome of Thursday's finale at Fenway Park — and whether Boston completed a third consecutive series sweep — had not been reported. Nor had the result of Castillo's debut on the mound for Chicago. The result of the Guardians game, and how the rest of Cleveland's visit unfolded, was likewise still to come.
Frequently asked questions
Who did the Chicago White Sox acquire at the trade deadline?
According to reports, the White Sox acquired veteran right-handed pitcher Luis Castillo from the Seattle Mariners around the trade deadline. General manager Chris Getz later explained the steps involved in completing one of the team's deadline deals. The full details of the trade, including what Chicago gave up in return, have not been reported.
When was Luis Castillo's first start for the Chicago White Sox?
Reports suggest Castillo was scheduled to make his first start for the White Sox on Thursday against the Boston Red Sox at Fenway Park, as Chicago tried to avoid another series sweep. How he performed in that debut has not been reported.
Why did the White Sox designate Austin Hays for assignment?
According to reports, the White Sox designated outfielder Austin Hays for assignment following a busy trade deadline. Designating a player removes him from the 40-man roster. What happened to Hays afterward — whether he was traded, claimed, or outrighted — has not been reported.
Did the Red Sox sweep the White Sox?
Reports indicate Boston beat the White Sox 4–0 on Wednesday and entered Thursday's finale at Fenway Park seeking a third consecutive series sweep. The Red Sox had reportedly won nine of their previous ten games and 25 of 28. The outcome of Thursday's game has not been reported.
What is the White Sox's situation heading into the 2026 season?
The 2026 season is the White Sox's 127th in Chicago, their 126th in the American League, and their 36th at Rate Field on the South Side. The club entered the season looking to improve on a 60–102 record from the previous year. They share Chicago with the National League's Cubs.
Compiled from reporting by 8 independent outlets. How we source our reporting.
