MIAMI — Josh Childress scored 17 of his 25 points in the fourth quarter and overtime, helping the Atlanta Hawks beat the Miami Heat 106-100 in an exhibition game Wednesday night.
 Joe Johnson scored 21 points and Marvin Williams added 17 for the Hawks (2-0), who got a game-high 15 rebounds from Josh Smith.
Shaquille O'Neal scored 10 first-half points in his preseason debut, and Udonis Haslem finished with 22 points and 12 rebounds for Miami (0-2). Smush Parker scored 14 points and Brian Chase — one of several players fighting for a roster spot — had 11 for the Heat.
Miami was outscored 6-0 in overtime, going 0-for-8 in the extra session.
Childress scored the final four points of regulation to pull Atlanta into a 100-all tie, then opened overtime with a three-point play.
Both teams had shots late in regulation to win.
Atlanta rookie Acie Law IV — who had the game-winner against Orlando on Monday — missed a 20-footer with 11 seconds left. The Heat got the rebound and set up a play for Haslem, who missed a contested shot in the lane, and Atlanta didn't get another shot off before overtime.
With O'Neal helping Miami control play, the Heat led by 14 points midway through the first half. But Atlanta owned a 161/2-minute stretch from there, outscoring Miami 41-16 and taking a 70-59 lead with 4:27 left in the third.
But Miami then pulled off its own rally, a 25-8 spurt that put the Heat ahead 84-78 after consecutive baskets by Chase and a baseline jumper by Haslem.
O'Neal didn't play in Miami's exhibition opener on Monday, and it's doubtful that he'll be a regular in the remaining five preseason games. But he looked at times like he's already in regular-season form.
He took a handoff from Jeremy Richardson and dunked shortly after tip-off, then caught a lob from Jason Williams about 5 minutes later and threw the ball down hard. O'Neal also scored on a jump hook while moving across the lane, and a turnaround jumper from the baseline — two of his go-to moves.
Notes: Miami's Southeast Division championship banner from last season is already hanging, with no fanfare. ... Richardson picked up his third foul with 5:48 left in the first quarter, fouling Johnson on a 3-point attempt. He got his fourth foul 15 seconds into the second half, again hitting Johnson on a 3-point try. ... Atlanta rookie Al Horford — a member of Florida's two-time NCAA championship teams — knocked over a couple of courtside chairs diving to save a loose ball. ... Miami F Penny Hardaway didn't dress for the second straight preseason game because of a quadriceps injury.