Yacabonis cleared waivers and was outrighted to Triple-A Tacoma on Thursday.
Yacabonis was designated for assignment by the Mariners earlier in the week, and he'll remain in the organization after passing through waivers unclaimed. He'll head to Tacoma, where he has a 1.72 ERA, 1.03 WHIP and 29:9 K:BB across 31.1 innings this season.