The Chicago White Sox took a swing at the trade deadline, bringing in pitching help and, most notably, Luis Castillo from the Seattle Mariners. But the move came with a heavy price tag, and the early returns have done little to quiet the concern.
Chicago not only gave up capital to get Castillo, it also took on the rest of his deal. That commitment is what makes the situation feel so precarious now, especially with the final year of his five-year, $108 million contract still on the books for 2027.
USA Today’s Bob Nightengale put the risk bluntly: "The Chicago White Sox, who grabbed Luis Castillo at the trade deadline, need to find a way to fix him 2027 or else they just wasted $20 million," Nightengale writes.
The hope was straightforward enough. A change of scenery might help Castillo rediscover the form that made him an All-Star. Instead, his production has moved in the wrong direction.
In 20 outings with the Mariners, Castillo posted a 5.06 ERA and finished the first half with a -0.6 bWAR. That was already a step down from the pitcher Seattle had hoped to get, even after his 3.54 ERA in 2025 and 3.64 ERA in 2024.
His stint with the White Sox has been worse. In nine outings, Castillo has a -0.9 bWAR and an 8.42 ERA over 31 innings pitched.
That leaves Chicago staring at an expensive problem. Castillo has been a net negative so far, and if he can’t straighten things out by 2027, the White Sox could be left looking at one of their biggest deadline bets as a costly miss.
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