Mariners reinvent piggyback rotation with a rotating six-man plan

Seattle’s rotation will return to a piggyback-style plan, but this time with six healthy starters sharing a five-man framework over the next ~30 days. The rotation will feature Logan Gilbert, George Kirby, Bryan Woo, Bryce Miller, Luis Castillo, and Emerson Hancock, with four traditional starts followed by piggyback relief days as starters rotate through the role. Miller and Castillo previously excelled in piggyback duties (1.67 ERA combined) and Seattle aims to keep the bullpen fresh while maintaining momentum as they lead the AL West.