Heim will catch and bat ninth Wednesday against the Giants.
He'll crack the lineup for only the second time in six games while No. 1 catcher Jose Trevino gets a breather for the day game after a night game. The Rangers had divvied up the starts between the backstops more evenly in May, but Heim has seemingly settled into a clear backup role at this point. The 25-year-old switch-hitter is slashing a weak .167/.228/.306 across 80 plate appearances in his first season in Texas.