Morgan Stroman added 14 points and Michelle Woods had 13 for the Hurricanes in their 30th straight home win.
Johnson scored eight points, including two 3-pointers, during an opening 22-0 run by Miami (9-1), which was never threatened.
The Warhawks broke the scoring drought on Larrie Williams’ jumper 4:53 into the game, but Miami scored the next 11 points and took a 33-2 lead on Jessica Capers’ jumper with 9:26 to go in the half.
Williams scored 11 points to lead Louisiana Monroe (1-10).
The Hurricanes shot 12 of 16 from the field in the first 9 minutes, while the Warhawks converted only one of 13 shots. Miami used mostly reserves over the second 10 minutes of the first half and built a 55-19 lead at halftime.
Saunders, in her most extensive playing time of the season, shot 6 of 8 from the field, including 2 of 3 from 3-point range.
NO. 23 DEPAUL73,
ARIZONA STATE 55
In Chicago, freshman Brittany Hrynko scored a career-high 25 points and DePaul beat Arizona State.
Katherine Harry and Jasmine Penny had 14 points apiece for the Blue Demons (10-2), who have won consecutive games since their 84-61 loss to Tennessee.
DePaul opened the game with a 9-0 run while Arizona State missed its first eight shots. Hrynko had 16 points in the first half as DePaul carried a 41-26 lead into the break.
Janae Fulcher scored 16 for the Sun Devils (7-2), and Kali Bennett finished with nine points.