ATLANTA -- Lou Williams wasn't instant offense in the fourth quarter like he'd been in his first two games with the Hawks. But he didn't have to be.
His new Atlanta teammates saw to that.
The Hawks outscored Indiana 20-3 over the last six minutes and stunned the Pacers 89-86 before a small crowd of 10,684 at Philips Arena on Wednesday night.
Williams, who came in leading the Hawks in scoring at 20.5 per game, had just four of his modest nine points in the final quarter. But his dunk with 17 seconds left after an inbounds play from side court put the comeback victory away.
Kyle Korver, who had been struggling with his shot, hit back-to-back 3-pointers as part of an 18-0 run and the Hawks improved to 2-1 with the victory despite giving up 18 straight points to Indiana (2-3) in the third quarter.
Atlanta, once down 83-69, finally took the lead on a 3-pointer from Jeff Teague with 1:04 remaining. Teague scored again to make it a four-point margin, but Lance Stephenson hit a 3-pointer to get the Pacers back close before Williams got away for his second dunk of the final quarter.
"It was just a heck of a win for us," Hawks coach Larry Drew said.
Teague, who dished out six assists, had nine of his 15 points in the fourth quarter and Korver scored eight of his 13. Al Horford led the Hawks with 16 points and had nine rebounds, five less than Zaza Pachulia.
David West and George Hill each scored 20 points for Indiana, which shot just 21.1 percent in the fourth quarter.
Of Williams' team-leading 41 points going in, 27 had come in the fourth quarter. The South Gwinnett graduate had 13 of his 22 points in the fourth quarter during a loss to Houston in the opener last Friday, then 14 of his 19 down the stretch in a victory at Oklahoma City on Sunday.
Williams hit a 3-pointer to start the second quarter and the Hawks outscored Indiana 17-4 run to take a 39-29 lead. But the runner-up as NBA sixth-man of the year last season with Philadelphia went back to the bench with 7:44 remaining in the quarter and the Pacers closed to 51-50 at halftime. Williams, who entered the game with 4:38 left in the first quarter, had all five of his first-half point during the run and both of his assists.
The Hawks built their lead back to 62-56 early in the third quarter, but then went ice cold. The Pacers scored 18 consecutive points to go up 74-62 and Williams, who returned with 5:24 to go in the quarter, missed four straight shots as the Hawks trailed 77-65 going into the fourth.
"Over the past four or five years of my career, the fourth quarter has probably been my best," Williams said. "I've always gotten off to slow starts for whatever reason. I just pick it up in the fourth quarter. It's something I've done in the past and something I want to bring to this team."
This time, though, it was Teague and Korver who got hot in the fourth quarter.
"From a coaching standpoint, you are going to ride the hot hand," Drew said.
Williams was just 1-for-5 from behind the arc and 4-for-11 overall for the game.
Drew started his big lineup for the first time this season, with Pachulia joining Horford inside and Josh Smith moving to small forward and Korver to guard. Smith, who scored 11 points against Indiana, missed the victory at Oklahoma City on Sunday with an ankle sprain.
The Pacers came in leading the NBA in rebounding, but the Hawks enjoyed a 51-41 edge on the boards.
The Pacers were without Danny Granger, their leading scorer last season, and that will be the case for the next three months. He received an injection on Tuesday to treat left patellar tendinosis.
The Hawks host the NBA champion Miami Heat on Friday, then hit the road for a four-game trip to the West Coast. By the time they play Orlando at home on Nov. 19, a lot more will be know nabout the new-look Hawks.