Scouting Report: Luis Castillo
Chicago Cubs | RP
Overall
Summary
Luis Castillo is struggling significantly in 2026 with a 6.57 ERA across 38.1 innings in 8 starts (later reports show 44 innings in 9 starts with 6.34 ERA). The Seattle Mariners are considering removing him from the rotation when Bryce Miller returns from injury. Castillo has been moved to a piggyback/bulk reliever role behind Miller, effectively sidelining him from traditional starting duties. His performance has been one of the worst among MLB starters this season, with inconsistent velocity, poor command, and inability to pitch deep into games. Despite being a three-time All-Star with a strong track record, Castillo has allowed at least 4 runs in 6 of his last 7 starts. He did earn one win against the Astros on May 15, showing brief signs of improvement.
Strengths
- Earned a win vs. Astros on May 15 with improved fastball velocity (mid-to-high 90s)
- Struck out 6 batters in that outing
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