Mariners activated RHP Cooper Criswell from the 60-day injured list.
Criswell returns to Seattle’s relief mix for Monday’s series opener against the Red Sox, his former club, after missing nearly two months with a right shoulder strain. The 30-year-old swingman has posted a serviceable 3.52 ERA, 1.17 WHIP and 23/8 K/BB ratio across 30 2/3 innings this season.