The Mariners shut down right-hander Emerson Hancock with a strained left adductor, placing him on the 15-day injured list retroactive to August 29. The injury sidelines a key rotation piece during the final stretch of the season. Hancock had been dealing with the issue for several days before Seattle made the move official Sunday. His absence creates depth concerns for a pitching staff already navigating injuries down the stretch. The Mariners will need other arms to step up as they push toward the postseason.