Seattle Mariners Make Roster Move on Off Day, Leading to Further Questions
SEATTLE — The Seattle Mariners are still searching for the short-term replacement to starting pitcher George Kirby. The 2023 All-Star was shut down during sprin
www.si.comHere are the latest updates I can share about Luis Castillo and the Seattle Mariners, based on recent reporting:
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In 2025, Castillo remained with the Mariners despite trade rumors; the club and Castillo maintained communication, and no trade waivers were finalized before his no-trade clause expired at the end of 2025. This provided him continuity with Seattle going into the 2025 season.[1][2]
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Castillo finished the 2025 season with a 3.64 ERA and a 1.17 WHIP across roughly 175 innings, dealing with a hamstring injury that sidelined him for a few weeks but left him positioned to return if the Mariners reached the postseason.[2][1]
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In the 2026 season, reports indicate Castillo has made starts and is part of Seattle’s plans, with some schedules suggesting piggyback starts (paired with a younger starter like Bryce Miller) in certain series; his ERA early in 2026 had risen as high as the mid-6.00s in limited outings, signaling some struggles as the rotation adjusts.[3][5]
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Additional outlets have noted Castillo’s ongoing role as a key member of Seattle’s rotation, with various game-by-game updates on his performance and health status throughout the 2026 season.[4][10][3]
If you’d like, I can pull the most current game-by-game stats for Luis Castillo (wins, losses, ERA, WHIP, strikeouts) and summarize his 2026 season trajectory, or focus on how he’s performing relative to peers in Seattle’s rotation. I can also provide a brief comparison table of his 2025 vs. 2026 performance.