Rios was designated for assignment by the Mariners on Friday.

Rios was acquired by Seattle from Tampa Bay on June 4 and was called up to the big leagues a day later. He failed to impress during his time with the Mariners, allowing a run in each of his three one-inning outings. The right-hander will be placed on waivers, where he could draw interest from team's in need of bullpen help.

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