North Dakota State opened the overtime period on a 7-1 run, highlighted by two Alexander baskets and an A.J. Jacobson 3-pointer. Alexander and Jacobson combined for all 16 Bison points in OT.
IUPUI would trim its deficit as low as four in OT, but could not overcome the slow start.
Jacobson and Dexter Werner each added 10 points for North Dakota State (13-6, 5-1 Summit League). It was Alexander's eighth game this season with 20 or more points.