Seattle right‑hander Luis Castillo earned his first win of the season Thursday, May 14, 2026, as the Mariners beat the Houston Astros 5‑3 at T‑Mobile Park. The 33‑year‑old tossed 5.2 innings, allowed three runs on four hits, issued three walks and logged a career‑high 108 pitches.
Castillo entered the game trying to snap a 0‑14 start, and the victory lifted his record to 1‑4 while keeping Seattle within striking distance of the AL West leaders. The numbers reveal a modest improvement: his ERA fell to 4.55 and his WHIP to 1.35 after the outing.
How Castillo’s outing reflects his recent form
Luis Castillo demonstrated that his swing‑and‑miss stuff is still effective, striking out seven batters and keeping Houston’s lineup to a .254 batting average. Yet the six‑run sixth inning exposed lingering stamina concerns, as he surrendered two runs after the fifth frame and saw his fastball dip from the high 90s to the low 90s.
Mariners consider a “piggyback” experiment
Seattle’s front office is weighing a “piggyback” plan that could see Castillo enter in relief behind Bryce Miller against the Chicago White Sox, a role he has never filled in his 13‑year career. The win was credited to Castillo, and the experiment would give the club a versatile arm for late‑inning matchups as the AL West race tightens.
Key Developments
- Castillo’s fastball averaged 94.2 mph Thursday, the highest velocity he has recorded since the 2022 season.
- The Mariners logged a team ERA of 3.92 in the game, the lowest of any of their starts this month.
- Seattle’s bullpen logged a combined 12.1 innings of work after Castillo’s exit, preserving the lead and highlighting depth.
Impact and what’s next for Seattle
Seattle’s rotation sits at a crossroads; Castillo’s win provides a morale boost but also raises questions about his durability. If the bullpen experiment works, the Mariners could gain a versatile arm for late‑inning matchups, a valuable asset as the AL West race tightens. Conversely, overuse could exacerbate fatigue, limiting his effectiveness in upcoming starts. The front office will weigh these factors when shaping the September rotation and playoff depth.
Luis Castillo’s career ERA sits at 3.97, and his 2025 season featured a 5.12 ERA over 92 innings. The numbers suggest that consistent work can bring his performance back in line with his career standards.
How many strikeouts did Luis Castillo record in his first win?
Castillo struck out seven batters during his 5.2‑inning effort against Houston, matching his season strikeout‑to‑walk ratio.
What was Luis Castillo’s pitch count in the game?
He threw a season‑high 108 pitches, the most he has delivered in any outing this year.
Will Luis Castillo pitch in relief next week?
Seattle is tentatively planning to piggyback Castillo behind Bryce Miller in the series versus the Chicago White Sox, which would be his first career relief appearance if it materializes.
What was Castillo’s fastball velocity during the start?
His fastball sat in the high 90s, averaging 94.2 mph, the highest since 2022.
How does the win affect Castillo’s season record?
The victory moved Castillo from 0‑4 to 1‑4, ending a personal winless streak that began the season.
