Both Bynum and Smith missed potential game winners at the end of the first overtime. Smith defended Bynum on a layup, but Villanueva played a role in successfully defending Smith's left-handed hook at the buzzer.
"Even though they were making some difficult plays, I think we were scrambling out on defense," Smith said. "We switched the pick-and-roll a little bit and we were trying to make it a little difficult for them to be able to shoot over a taller defender. That's what we were able to do — limit them to one shot and get the rebound."
For the Pistons, who were trying to earn a rare three-game winning streak, the loss dropped them to 3-14 on the road, 9-22 overall.
There was little consolation for Bynum.
"I got hot, and other guys picked it up, and piece by piece things started to work," Bynum said. "We got back in the game, but I missed a key layup at the end. That was unbelievable. The missed shots haunt me now, and they were still haunting me while we were out there. We put forth a great effort, but it just wasn't enough."
The Hawks improved to 10-5 at home, 17-9 overall.
"A couple of times I thought we were dead in the water," Atlanta coach Larry Drew said. "It was a really hard fought win."
Notes: According to the Hawks' postgame notes, Detroit's 85 points off the bench were an NBA single-game high this season. ... Hawks G Devin Harris missed his fourth straight game with a sore left foot. ... Atlanta G Kyle Korver was 2-for-11 from the field. ... Smith's point total was his best since March 31 at Philadelphia, when he had 34. His high of 38 was on Nov. 17, 2007, at Milwaukee. ... Bynum's career high is 32 points, scored against Charlotte on April 5, 2009. ... Detroit's last three-game winning streak was last March 31-April 5 in a homestand against Charlotte, Orlando and Washington.