Thielbar has given up three runs in five innings this spring and isn't a lock to make the major league bullpen, the Minneapolis Star Tribune reports.

He does have a 5:1 K:BB ratio in five innings this spring. It's surprising he's on the roster bubble since he was in the majors all last season and effective (3.40 ERA). Thielbar is battling Aaron Thompson, A.J. Achter, J.R. Graham, Mark Hamburger and Stephen Pryor for one of the final two spots in the bullpen.

Thielbar gave up a run in two-thirds of an inning in the second game of Thursday's doubleheader sweep to the Indians to increase his ERA to 3.45.

Thielbar has seen his strikeout rate decline to 6.5 strikeouts per nine innings from 7.6 last season, but he's largely had the same season despite an increase in his ERA to 3.45 from 1.76. He's given up more hits, however, as a he's seen a sharp increase to a .312 BABIP from a .181 BABIP last season.

Caleb Thielbar picked up a win in relief after pitching a perfect inning against the Indians on Monday.

Thielbar was primarily used when the Twins were down last year, but he's getting more work in close games now, even if he's often just being called on to face one or two batters at a time. He already has two wins and two holds in his 13 appearances, and he's allowed two runs in 9 2/3 innings total.

Caleb Thielbar pitched a scoreless frame to help the Twins top the Marlins 4-2 on Sunday.

Thielbar was great but underutilized last year. This spring, he's allowed one run in five innings, but it doesn't sound like he'll make the staff with the Twins likely to keep at least a couple of guys who are out of options. That's a shame because he's probably one of the team's better relievers.

Caleb Thielbar was unavailable Friday due to a groin injury.

The Twins are listing him as day-to-day for now. Thielbar has a 0.83 ERA in 20 relief appearances this season.

Twins activated LHP Caleb Thielbar from the bereavement list.

Thielbar has burst onto the scene as one of the major's elite LOOGYs this season. He's allowed only one run over 21 innings. Twins manager Ron Gardenhire will work Thielbar into high-leverage situations, which should increase his value in holds leagues.

Twins placed LHP Caleb Thielbar on the bereavement list.

The left-hander should be back by the end of the week. He has a cool 0.45 ERA in 20 innings this season.

Twins recalled LHP Caleb Thielbar from Triple-A Rochester.

Thielbar, a member of the independent St. Paul Saints just a couple years ago, was sporting a cool 3.76 ERA and 34/8 K/BB ratio in 26 1/3 innings this season at the Triple-A level. He will serve as a middle reliever.