ATLANTA — Josh Smith scored 22 points and grabbed 18 rebounds, leading the Atlanta Hawks to an 83-74 victory over Boston in Game 1 of the Eastern Conference playoffs Sunday night, the final minute turning ugly when Celtics star Rajon Rondo was ejected for bumping an official.

The Hawks, who led by as many as 19 in the first half, were clinging to a four-point lead when Rondo lost his cool with 41 seconds remaining — and may have cost himself a chance to play Game 2 Tuesday night.

Additional Photos

Atlanta Hawks' Jeff Teague, left, puts up a shot past Boston Celtics' Brandon Bass in Game 1 of the opening round of the playoffs Sunday in Atlanta. The Associated Press

Brandon Bass was called for a foul on Smith tussling for a loose ball. Rondo screamed at official Marc Davis, who quickly called a technical. Rondo then bumped Davis with his chest and was tossed out. A suspension could be coming, too.

Rondo scored 20 points and dished out 11 assists, but none of it mattered when he lost his cool. The Celtics not only lost this game, they might’ve lost their floor leader for the next one. He clearly stuck out his chest to strike the official, which will almost surely draw the wrath of NBA Commissioner David Stern.

The Hawks got off to a dazzling start, looking much quicker and faster than the aging Celtics. With every starter outside of Jason Collins contributing at least four points, the Hawks raced to a 20-6 lead with the game just over 5 minutes old.

With Atlanta’s backups on the court, the Celtics made a brief spurt at the start of the second quarter, slicing the Hawks’ lead to 33-24. That would be as close as they got until the fourth. Atlanta coach Larry Drew called a timeout, got Smith and Johnson back on the court, and the Hawks quickly ripped off an 11-1 run to push their lead back to 19. The home team led 49-35 at the break.

But the Hawks got sloppy with the ball and made only 20-of-60 shots after their blistering performance in opening quarter. That allowed the Celtics to edge back into the game, and it looked as though they might just pull off the comeback until Rondo’s big no-no.

Kevin Garnett bounced back from a miserable start to put up 20 points and 11 rebounds. Smith carried the Hawks on a night when Joe Johnson managed just 11 points on 3-of-15 shooting.

Both teams were short-handed.

Celtics guard Ray Allen missed a playoff game for the first time in his career, watching from the bench in a suit and tie because of an ailing right ankle. He would’ve already had surgery if it was earlier in the year, but the 36-year-old member of Boston’s Big Three is hoping to heal in time for possibly his last hurrah in Beantown.

The Hawks, meanwhile, started third-stringer Collins at center. Al Horford missed most of the year with a pectoral injury and has been ruled out for the entire series, and the guy who took his place, rugged Zaza Pachulia, went down late in the regular season with a sprained left foot.

Pachulia famously went forehead-to-forehead with Garnett during the 2008 series, and the Hawks wondered how they would fare without the Georgian’s toughness. Just fine, it turned out.

The teams were much more closely matched heading into this series than they were in their last playoff meeting, an opening-round clash in 2008. That year, the Celtics won 66 games and were the top seed in the East, setting up for a run to their most recent NBA championship. The Hawks were the eighth seed, a team that went 37-45 and made the postseason for the first time in nine years. Still, they managed to push the Celtics to seven games.

This time, Boston won the season series 2-1, the three games decided by a total of 10 points, and Atlanta finished one game ahead in the conference standings to earn home-court advantage.

There was much talk about the matchup between Garnett and Smith, who had the best year of his up-and-down career after Horford went down. It wasn’t much of a contest in the first half. Even with an embarrassing pose on a 3-pointer from the corner that didn’t hit anything, Smith lit up the Celtics for 15 points, 11 rebounds and two assists by halftime. Garnett managed just two points on 1-of-9 shooting.

But KG turned it around in the second half, leading the Celtics back from the big deficit.

NOTES: Allen and Pachulia are both listed as day-to-day. … The Hawks have never beaten Boston in the playoffs since moving to Atlanta in 1968, losing six straight postseason meetings. … The teams met four times in the finals when the Hawks were based in St. Louis. Boston won three of those series, the Hawks only playoff win over the Celtics a 4-2 triumph to win the title in 1958.

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