They didn't let the Bulls get closer than four until Butler hit a 3-pointer with 31.1 seconds left in the third quarter, and Chicago couldn't tie the score until Deng hit an 8-footer early in the fourth.
The Nets kept trying to get back in it, getting it all the way down to four on a 3-pointer by Williams with 26 seconds left, but Belinelli hit four free throws from there.