Miller Returns as Mariners Roll With Six-Man Rotation

The Mariners will reinstate Bryce Miller from the injured list to start this week against the Astros, starting with a six-man rotation and potentially using a Miller–Castillo piggyback plan to ease workloads. Miller has battled injuries (oblique in spring, elbow inflammation in 2025) but is back in the mix, while Emerson Hancock has emerged as a breakout in Miller’s absence. Castillo has struggled recently, and Seattle is keeping all rotation options open with the next off-day not until May 21, aiming to preserve rest and stability as Miller returns.