While Castillo isn't necessarily the "ace" that the M's acquired in 2022, he's still a very dependable starter with ace-like qualities. He went just 11-12 this season, but that was more a product of the M's tepid offense. He had a 3.64 ERA and made 30 starts for the second consecutive season. He's a three-time All-Star who represented the Mariners at the All-Star Game in 2023. - Farkas