Williams had 10 in the first half when the Rockets (5-2) shot 52 percent to open a 36-23 lead. The Vikings (2-5) shot 37 percent.
Toledo pushed the lead to 20 points near the midpoint of the second half with a 9-0 run before the Vikings battled back, cutting the deficit to 10 with 4:17 to play.
The Rockets made their final 10 free throws and made 12 of 14 in the final 5:34 without a field goal. They finished 22 of 30 in the second half, 26 of 36 for the game.