The Rangers recalled Pennington from Triple-A Round Rock on Friday.
Pennington was assigned to Round Rock after being acquired by the Rangers on Monday from the Royals in exchange for Michael Lorenzen. Across 39 outings in Triple-A this season, Pennington has a 2.13 ERA with 84 strikeouts across 63.1 innings. His move to the big club corresponds with the Rangers placing right-hander Max Scherzer (shoulder) on the 15-day injured list.