Twins' Caleb Thielbar: Slated to open on IL

Twins president of baseball operations Derek Falvey said Monday that Thielbar (hamstring) will begin the season on the injured list, Bobby Nightengale of the Minneapolis Star Tribune reports.

Thielbar had a setback with his left hamstring during Saturday's live batting practice session. There's no timetable at this juncture for the left-handed reliever's return. It's a blow to a bullpen that will also be without Jhoan Duran (oblique) at the start of the season.