Scouting Report
Updated May 20, 2026
Luis Castillo, a three-time All-Star pitcher for the Seattle Mariners, is experiencing a significant performance decline in the 2026 season. Through eight starts, he has posted a 6.57 ERA with a 1.66 WHIP and 31:13 K:BB ratio over 38.1 innings. After allowing four runs in four innings against the White Sox on May 10, the Mariners announced plans to move him to a piggyback relief role with Bryce Miller rather than keep him in the traditional starting rotation. This represents a major shift from his previous four seasons of consistency (3.17-3.64 ERA). The team is considering a six-man rotation or bullpen usage as alternatives. Castillo earned a win against the Astros on May 15 (3 runs, 5.2 IP), providing some hope, but his overall performance has been among the worst in MLB this season.
Strengths
- + Earned a win vs. Astros with improved performance (3 runs, 5.2 IP)
- + Still striking out batters at a decent rate (6 K in recent outings)
- + Showed fastball velocity in mid-to-high 90s in some starts
- + History of success and consistency over previous four seasons
- + Experience as a three-time All-Star pitcher
About
Luis Castro is a first baseman for the Chicago Cubs.
Player Overview
1B
Chicago Cubs