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Gregory Shamus, Getty Images
Boston's Paul Pierce \— sporting championship cap and T-shirt, celebrates after the Celtics' win.

AUBURN HILLS, Mich. — Boston got past an old nemesis to set up a matchup with another rival.

Paul Pierce scored 27 points, Ray Allen had 17 and Kevin Garnett added 16 to lift the Celtics to an 89-81 victory over the Detroit Pistons on Friday night in Game 6 of the Eastern Conference finals.

Boston, which locked up with Detroit many times in the 1980s, will now rekindle another classic series in the NBA finals against the Los Angeles Lakers.

"It's kind of surreal," Garnett said.

The Celtics are in the NBA finals for the first time since losing to the Lakers in 1987, the third meeting in a four-year span.

The Pistons were eliminated on their home court for the first time during a six-year run that included a trip to the conference finals each year and the 2004 title.

Boston entered the series without a road win in the postseason, then beat Detroit on its home court twice to win the grueling series.

After playing two Game 7s, the Celtics will get a needed break before hosting Kobe Bryant and the Lakers on Thursday night.

"We're emotionally drained," Garnett said.

Chauncey Billups scored a playoff-high 29 points and Richard Hamilton had 21, but the rest of their teammates had lackluster efforts — especially Rasheed Wallace.

At one point Billups had 21 points, matching the total for the rest of the team.

Wallace scored just four points on 2-of-12 shooting and had three turnovers in what might've been his last game as a Piston and could've been Flip Saunders' last as Detroit's coach. President of basketball operations Joe Dumars will likely make some sort of changes on the bench, the court or both.

"I'm sure that's something Joe and I will sit down and evaluate," Saunders said.

After it was 58-all, Detroit closed the third quarter with a 10-2 run and took its first lead since midway through the opening quarter.

Just when it seemed the Pistons might be in control with a 70-60 lead early in the fourth, the Celtics scored nine points in less than 2 minutes and went on a 19-4 run that put them ahead 79-74.

Billups' three-point play pulled Detroit to 83-79 with 2:24 left, then the Pistons wasted a chance to get closer.

Tayshaun Prince grabbed a loose ball after a Boston miss and turned the ball over when James Posey surprised him from behind and snatched it away.

Pierce made two free throws on the possession, putting the Celtics up by six with 1 1/2 minutes to go.

"It was the best fourth quarter we played all playoff long," Pierce said.

The Pistons failed on their 3-pointers down the stretch and couldn't take advantage of Garnett missing two free throws with 36 seconds left.

The Pistons were eliminated at home for the first time since Pierce helped Boston do it in the second round of the 2002 playoffs. Detroit had won its previous five games this postseason when coming off a loss.

Detroit lost Game 6 of the conference finals for the third straight year and with only one title and two NBA finals appearances during its impressive six-year run, the franchise will draw more comparisons to baseball's Atlanta Braves.

The Celtics, meanwhile, validated their bold move of adding Garnett and Allen to Pierce to form a Big Three. They played key roles in the decisive fourth quarter, helping Boston outscore Detroit 29-13.


NBA Finals

Game 1: L.A. Lakers at Boston Celtics

Thursday, 6:30 p.m., ABC