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The Athletics designated Muller for assignment Tuesday.
The left-hander last pitched since Aug. 3 versus the Dodgers and surrendered six runs across one inning. Muller had a 3.02 ERA, 1.13 WHIP and 32:9 K:BB in 41.2 frames this season prior to that outing, but he won't retain his place on Oakland's 26-man and 40-man rosters.
