The Rangers recalled Leiter from Triple-A Round Rock on Wednesday.
Leiter will officially serve as the Rangers' 27th man as he starts the second game of Wednesday's twin bill, though he is expected to remain in the big-league rotation for another several starts. The 24-year-old right-hander gave up 17 runs in only 9.1 innings over his first three MLB starts early in the season, but he's since logged a 3.83 ERA and 1.43 WHIP over 51.2 innings in Triple-A.