Scouting Report: Luis Castro
Chicago Cubs | 1B
Overall
Summary
Luis Castillo, a three-time All-Star pitcher for the Seattle Mariners, is experiencing a significant performance decline in the 2026 season. Through his first 8 starts, Castillo has posted a 6.57 ERA with a 1.66 WHIP and 31:13 K:BB ratio over 34.1 innings. After allowing 4 runs in 4 innings against the White Sox on May 10, the Mariners announced plans to move him to a bullpen/piggyback role with Bryce Miller rather than keep him in the starting rotation. His struggles represent a dramatic departure from his previous consistency (3.17-3.64 ERA over his first four years with Seattle). He earned a win on May 15 against the Astros (3 runs, 5.2 innings), providing some hope, but the team is clearly exploring alternative roles for the 33-year-old veteran.
Strengths
- Earned a win vs. Astros on May 15 with improved performance (5.2 IP, 3 R, 6 K)
- Fastball velocity showed signs of recovery in mid-90s range in recent starts
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