Nicholas Paulos scored 11 points for the Spartans (2-5).
UNC Greensboro shot 58.9 percent (33 of 56) from the field, 52.4 percent (11 of 21) on 3-pointers. The Citadel shot 30.9 percent (17 of 55) from the field.
The Spartans blew the game open in the first half. They opened on a 14-5 run, with Trey Simpson scoring seven points. They pushed it to 23-8 on Paulos' 3-pointer and 33-12 on Derrell Armstrong's layup with 7:06 remaining.
Drew Parker's 3-pointer made it 36-14 with 5:33 left, and UNC Greensboro cruised to a 46-21 lead at the break against its North Division foe.