The Zips (4-2) broke a 52-all tie midway through the second half as Reggie McAdams drained two 3-pointers.
Oral Roberts (5-6) cut the deficit to two after a Shawn Glover dunk, but Akron surged away from there with a 14-4 run capped off by a dunk from Nick Harney to grab their largest lead, 73-61 with 1:04 remaining.
Akron shot 43.9 percent from the field and hit six 3-pointers to the Golden Eagles' one. Diggs was 8 of 10 from the line and had seven rebounds. Harney was the third Zips player in double figures with 11 points.
Oral Roberts had a similar shooting percentage of 42.6 percent, but committed 20 turnovers. Glover finished with 21 points and Korey Billbury added 14 with seven boards.
Mike Brey is looking at former Notre Dame players to fill two assistant jobs that have opened up with the departures of Martin Ingelsby and Anthony Solomon.
Purdue's 2016-17 prospects got a jolt Wednesday when forward Caleb Swanigan announced he will return for his sophomore season.
Clemson's Jaron Blossomgame says he is withdrawing from the NBA draft and returning to school for a final season.