Bojan Bogdanovic scored 27 points, Collison added 22 and the duo combined for eight points during the decisive run, leading Indiana to a 105-96 victory over the Chicago Bulls.
Indiana took control in the first six minutes and never trailed until Zach LaVine's dunk capped a 7-2 fourth-quarter run that gave the Bulls their only lead, 86-85, with 7:08 to go.
Just 81 seconds later, the lead was gone - for good.
Bogdanovic made two free throws to put Indiana back in front, then knocked down a 3-pointer. Collison followed that with another 3 and when Myles Turner ended the 10-0 run with a dunk at the 3:58 mark, the Pacers led 95-86.
Lauri Markkanen finished with 14 points and 13 rebounds. He's had nine or more rebounds in 16 consecutive games.
The Bulls spent most of the night playing catch-up after starting 6 of 23 from the field. They finished 4 of 25 on 3s.
The Bulls close out a back-to-back tonight when Philadelphia comes to town.
The Pacers will try to earn a split in the series when they visit the Milwaukee Bucks on Thursday.