Garver (back) is batting third and is the designated hitter for Friday's game against Baltimore.
Garver was scratched from Seattle's lineup ahead of Tuesday's game against Kansas City due to upper-back spasms, Daniel Kramer of MLB.comreports.
Garver (undisclosed) was scratched from the Mariners' lineup Tuesday versus the Royals.
Mitch Garver knocked an RBI-double to extend the Seattle Mariners' lead over the Houston Astros.