The Rockies have optioned struggling outfielder Drew Stubbs to Triple-A, Nick Groke of the Denver Post reports (Twitter links). Taking his place on the active roster is Brandon Barnes.

Stubbs, 30, avoided arbitration with a $5.825MM contract this year — his final before hitting the open market. Notably, given his 5+ service time, Stubbs both had to pass through revocable optional waivers and consent to the assignment.

This season has been nothing but hardship for Stubbs, who is slashing just .118/.182/.255 in 56 plate appearances. That represents a notable disappointment for him after a stellar 2014 campaign in which he put up a strong .289/.339/.482 batting line. Though he only took 424 plate appearances, strong baserunning and solid defensive marks let him with 2.6 fWAR and 2.7 rWAR.

Barnes, meanwhile, joined Stubbs as a pre-2014 acquisition for Colorado, but the 29-year-old did not enjoy quite as much success. He has been working at Triple-A this year, where he has put up a .205/.266/.364 slash over 143 turns at bat.