Caden Dickerson triple just before the halftime buzzer puts the Hilltoppers up nine – matching their largest lead of the night.
Dickerson and Pettigrew led WKU with nine each – as the Tops shot 57.7 percent from the floor despite nine turnovers.
Teeng Akol added eight points, three rebounds and two blocks off the bench.
UALR shot just 37.9 percent – and leading scorer Solomon Bozeman had just two.
Tops also beating the Trojans on the glass, 19-11.