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Stumpf was optioned to Triple-A Toledo on Wednesday, Jason Beck of MLB.com reports.
Artie Lewicki will take Stumpf's place on the active roster after the latter was cast off the 25-man prior to Wednesday's game. Across 41 relief appearances with the Tigers this year, Stumpf has logged an abysmal 7.11 ERA and 2.01 WHIP with a 5.3 BB/9.
