Hildenberger signed with the Red Sox as a non-roster invitee Saturday, Chris Cotillo of The Springfield Republican reports.
Hildenberger didn't look good in his 16.1 innings for the Twins last season, posting a 10.47 ERA and a 2.27 WHIP. He can blame a .459 BABIP for some of his struggles, but his 4.81 FIP wasn't exactly promising.