The Mavericks (16-22) fell to 8-8 in SBC action, snapping a two-game league winning streak.
UT Arlington is 8-7 in Sun Belt Conference play after starting 1-5.
Eric Tate went 4-5 and drove in two runs in Saturday's victory at Georgia State.
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.