Rumbelow was sent down to Triple-A Tacoma on Friday.

The Mariners will replenish their bullpen after Rumbelow allowed four earned runs on four hits -- including two home runs -- and one hit batsman during Thursday's series finale against the Angels. Across 10.1 innings of work with the big-league club this season, he's posted an unsightly 7.84 ERA and 1.65 WHIP.

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