The Mariners declined Robles' $9 million club option for the 2027 season Thursday, Daniel Kramer of MLB.com reports.
Robles' time in Seattle will come to an end after two seasons, during which he slashed .251/.300/.318 across 263 plate appearances. The 29-year-old's speed may be enough for him to land a major-league deal in the offseason, but his poor offensive output will limit his fantasy appeal.