Rumbelow was designated for assignment by the Mariners on Friday.

Rumbelow made three appearances for the Mariners back in March but was removed from the 25-man roster after allowing four runs while recording just four outs. Since then, he's allowed 16 earned runs in 15.2 frames for Triple-A Tacoma, leading to him being removed from the 40-man roster as well. Andrew Moore was claimed off waivers in a corresponding move.

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