They’ve succeeded in locking up Castillo. And Seattle entered Saturday with a three-game lead over Baltimore for the final AL wild card.
"Luis has been one of the top pitchers in MLB over the past six seasons,” Mariners President of Baseball Operations Jerry Dipoto said. “He is a dynamic power pitcher in the prime of his career with a track record of consistency. Bringing him to Seattle represented a key moment in our ongoing efforts to build a championship roster. Similarly, this deal illustrates our continued commitment to both the present and future of this team.