Scouting Report: Moises Castillo
Chicago Cubs | SS
Overall
Summary
Luis Castillo, a 33-year-old right-handed pitcher for the Seattle Mariners, is struggling significantly in 2026 after being a model of consistency in previous seasons. Through 9 starts and 44 innings, he has posted a 1-4 record with a 6.34 ERA, 1.57 WHIP, and 43 strikeouts. The Mariners are considering moving him to the bullpen as a piggyback reliever following Bryce Miller's return from an oblique injury. Castillo has allowed at least 4 runs in 6 of his last 7 starts and has failed to pitch at least 5 innings in multiple outings. His performance metrics are concerning, with an xBA of .304 (bottom 6%) and average exit velocity of 92.2 mph (bottom 5%). The team is evaluating a six-man rotation or bullpen role as alternatives to keeping him in the starting rotation.
Strengths
- Three-time All-Star with proven track record
- Showed swing-and-miss ability in recent start vs Astros
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