Mariners Shock Ace Castillo: Bullpen Bound!

The Seattle Mariners have made a significant pitching rotation change, naming Bryce Miller as a starter and moving veteran ace Luis Castillo to the bullpen for the first time in his ten-year MLB career. This decision, announced by manager Dan Wilson, comes as Castillo is off to his worst career start, with a 1-4 record and a 6.34 ERA through his first nine starts.

Miller, returning from an oblique strain, will make his second start against the Chicago White Sox on Tuesday. The Mariners plan a piggyback approach, expecting Miller to pitch four to five innings, followed by Castillo for three to four innings in relief. While Castillo has accepted the new role, understanding its importance for the team, the Mariners acknowledge it's a new situation for him.

This experimental move aims to address Castillo's struggles, which have seen his ERA climb to 7.34 in his last eight starts after a strong opening performance. The team is exploring this strategy as an alternative to a six-man rotation, which they deem less ideal for developing their top arms. The success of this piggyback plan will determine future rotation decisions.