White Sox $21 Million Gamble on Luis Castillo Ends in Shoulder Injury and an 8.42 ERA

The Chicago White Sox's $21 million deadline gamble on Luis Castillo has officially crashed and burned. The team is placing the veteran starter on the 15-day injured list with a right shoulder impingement, a move that Bob Nightengale reports will likely end his season.

Paying $21 million for nine starts and an 8.42 ERA is the kind of return on investment that usually involves buying a yacht sight unseen from a guy on the internet. Castillo was supposed to be the missing piece when Chicago shipped out Seranthony Domínguez, Nolan Jones, and Boston Smith to the Seattle Mariners on August 1.

"Bob Nightengale reported the injury will likely end Castillo's season."

Instead, he went 1-2 in a White Sox uniform, giving up runs like a broken ATM. His overall season numbers now sit at a grim 4-11 with a 5.85 ERA and a 1.49 WHIP.

For anyone holding White Sox futures or betting their daily moneylines, this rotation just lost its most expensive arm right as the playoff race tightens. Chicago has actually been scoring runs lately, putting up 14 against the Kansas City Royals and taking three of four from the Detroit Tigers, but you cannot out-hit an 8.42 ERA every fifth day.

This is not exactly a new issue for Castillo, either. He missed nearly a month with a shoulder injury back in April 2022, making this massive financial roll of the dice look even more reckless in hindsight.

With Castillo likely shut down until spring training, the White Sox have to patch together their rotation for the final stretch. The front office swung for the fences at the trade deadline, but all they got was a very expensive medical bill.