Despite a strong push to cut a double-digit lead to four late in the game, the Islanders topped the Wildcats 76-67.
Juniors Jaylen Franklin and Jaren Lewis led the Wildcat offense with 21 points and 17 points respectively.
ACU is now 7-8 in conference play with three games left. The Wildcats will likely need wins in two of their next three games to clinch a spot outright, in the Southland Conference Tournament.