The Twins released Bowman on Monday, Bobby Nightengale of the Minneapolis Star Tribune reports.
Bowman exercised an opt-out clause in his minor-league contract when the Twins informed him they didn't have any immediate plans to promote him. The sinkerballer had turned in eight straight scoreless appearances at Triple-A St. Paul. Bowman has allowed nine runs with a 10:7 K:BB over 15 innings in the majors this season, covering stints with the Twins, Diamondbacks and Mariners.