Jeremy Morgan posted a double-double with 15 points and 10 rebounds for the Panthers (3-1). Aarias Austin had 12 points and five rebounds and Bennett Koch added 11 points and five rebounds. The team averaged 55.6 percent shooting from the field, 70.6 percent from the line and had a 42-28 rebounding edge over the Spartans.
Northern Iowa went up 35-25 on an Austin 3-pointer with 3:03 left in the first half and the Panthers led 38-31 at the break.
Washpun sank a 3-pointer to make it 60-51 with 8:24 to play and Wyatt Lohaus hit two more in the final three minutes to seal the win.
Andre Norris scored 20 points with eight rebounds for the Spartans.