Polanco is out of the lineup for Sunday's game against the Astros.
The switch-hitting Polanco still isn't fully comfortable batting as a right-hander while he's been managing a sore side for much of the season, so the Mariners will hold him out of the lineup for a second straight day while the Astros send another southpaw (Colton Gordon) to the bump. Mitch Garver will replace Polanco as Seattle's designated hitter.