Scouting Report
Updated May 19, 2026
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
- + Veteran pitcher with 10+ years of MLB experience and three All-Star selections
- + Previously a model of consistency (3.17-3.64 ERA over first four years with Mariners)
- + Helped Mariners break 21-year playoff drought in 2022
About
Luis Castillo is a sp for the Seattle Mariners.
Player Overview
SP
Seattle Mariners
Recent News
The Opener: Ginn, Emerson, Crews
May 19, 2026
The Opener: Ginn, Emerson, Crews
May 19, 2026
Mariners manager Dan Wilson confirmed Bryce Miller and Luis Castillo will piggyback during Tuesday's game against the White Sox.
May 18, 2026
Luis Castillo: Working as bulk reliever Tuesday
May 18, 2026
Luis Castillo and Bryce Miller will both pitch Tuesday against the White Sox.
May 16, 2026