Spencer Butterfield scored a career-high 23 points for Utah State, which played its second straight game without injured starters Preston Medlin and Kyisean Reed.
Texas-Arlington (9-8, 4-4 WAC) outscored the Aggies 24-14 inside the paint, shot an even 40 percent from the floor and was 25 of 34 from the free-throw line.
Butterfield made four 3-pointers, grabbed 11 rebounds and had three assists to lead Utah State (14-4, 5-3). Ben Clifford had 12 points, nine rebounds and four blocked shots.
“We tried hard," said head coach Stew Morrill. "We were just a few plays away from having a chance to win. We’ve just got to keep fighting, that’s all we can do. We’re not looking for excuses. We had lots of chances."
Greg Gainey had 10 points and eight rebounds for Texas-Arlington. Shaq White-Miller scored 11 points and was 8 for 9 from the free-throw line, and added four assists and three steals.
Texas-Arlington had lost five of its last seven games until the victory over the Aggies.
“All the credit goes to UT Arlington," said Butterfield. "The played well down the stretch and we made a couple of mistakes. We had a chance but they played a better game. They definitely stepped it up on the boards in the second half."
The Aggies next host Louisiana Tech Saturday night at the Spectrum.