Connecticut trailed by 22 points at halftime and got as close as 16 early in the third quarter at 48-32. But Indiana outscored Connecticut 14-7 the rest of the way and had a 62-39 lead entering the fourth period.
Douglas hit a 3-pointer early in the fourth period and later a pair of free throws that gave Indiana its largest lead at 75-44.
It was the lowest point total for the Sun franchise since Aug 1, 2003, when they scored 45 points in a 48-45 loss to Washington. Connecticut's seven-point output in the fourth was a franchise record low.