Scouting Report: Luis Castillo
Seattle Mariners | SP
Overall
Summary
Luis Castillo is struggling significantly in 2026 with a 6.57 ERA and 1.62 WHIP across 38.1 innings in 8 starts (0-4 record). The Seattle Mariners are considering removing him from the rotation with the return of Bryce Miller from an oblique injury. Castillo has been moved to a piggyback reliever role behind Miller, marking a significant role change for the veteran pitcher. He allowed 4 runs in 4 innings against the White Sox on May 10, and has allowed at least 4 runs in 6 of his last 7 starts. His only win came against the Astros on May 15 when he allowed 3 runs over 5.2 innings. The team is exploring a 6-man rotation, bullpen role, or potential demotion to Triple-A.
Strengths
- Earned a win vs. Astros on May 15 with 6 strikeouts
- Showed swing-and-miss ability in recent outings
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