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Detwiler was designated for assignment by the Mariners on Wednesday.
The Mariners needed a fresh reliever following Tuesday's bullpen game, and Detwiler, who covered six innings in his lone big-league appearance this season Tuesday, was the roster casualty. Nick Rumbelow was recalled from Triple-A Tacoma to replace the veteran southpaw in the bullpen. Detwiler likely report back to Tacoma if he passes through waivers untouched.
