Last season was a special one for the Seattle Mariners rotation, and one of the most intriguing aspects was that Luis Castillo was the least productive member of the preferred starting five. He ranked as the worst in bWAR, ERA, ERA+, FIP and WHIP.
This was surprising given Castillo was the Opening Day starting entering the 2024 season, had the most experience, and was coming off the third All-Star selection of his career a year earlier. Some wondered if this alluded to just an inevitable beginning of a decline which usually happens once players reach their 30s.
As a result of all this, the 32-year-old lost his role as the M's Opening Day starter this season to Logan Gilbert.