It's unfortunate that it took an injury to the team's best setup man for this to happen, but with Casey Fien headed to the disabled list the Twins have called up Michael Tonkin from Triple-A. Rochester's bullpen is packed with intriguing relievers, several of whom look like better options than members of the Twins' bullpen, but based on the combination of minor-league track record, major-league track record, and raw stuff Tonkin appears to be the best bet.
Known first as Jason Kubel's brother-in-law, then as a decent starter prospect, and now as a good reliever prospect, Tonkin has thrived since shifting to the bullpen full time in 2011 and the 6-foot-7 right-hander should have cracked the Opening Day roster rather than be sent back to Rochester for a third straight season at Triple-A.