The Mavericks couldn't hold onto a 9-7 lead going into the bottom of the seventh.
UTA won its fifth straight Sun Belt game to open the day, but lost the second in extra innings.
UTA takes on Columbia on Wednesday to continue a five-game homestand at 6:30 p.m.
UTA and Texas State continue the series on Saturday at 3 p.m.
The three-game series is tied 1-1 with the rubber match Sunday at 1 p.m.