Castillo (shoulder) was activated off the injured list Saturday.

Castillo wound up missing two weeks with right shoulder inflammation. He's only recorded one save in 10 appearances for the Mariners since coming over from the Rays at the deadline, but he should be one of the team's top ninth-inning options down the stretch. Paul Sewald has saved eight games this season while striking out 41.0 percent of opposing batters en route to a 2.44 ERA, however, so Castillo could face stiff competition for save chances.

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