The Mavericks (8-16, 5-6 Summit) shot 63 percent from the floor, hit 6 of 12 3-pointers and made 16 of 20 free throws to win their third straight game and avenge an 18-point loss to the Mastadons (10-14, 3-7) on Jan. 5.
The Mavericks trailed 41-36 at halftime but hit 15 of their next 16 shots and finished with a 78.2 shooting percentage in the second half. They were up by two with 7:45 remaining when Simmons hit a 3-pointer, Carter followed with a three-point play and Simmons added a layup to make it 75-65 with 6:34 remaining.
Reggie Witherspoon, who spent more than 13 seasons coaching at Buffalo, is returning to the city to coach Canisius College.
North Carolina Hall of Fame men's basketball coach Roy Williams is recovering from knee-replacement surgery.
Sparkling facilities are one thing, but Tim Miles needs to regain the momentum of Nebraska's 2014 run to the NCAAs if it is to play with the big boys.