BOSTON – Jermaine O’Neal and Paul Pierce finally showed up and sparked the Boston Celtics to their first win of the season.

And they kept the Detroit Pistons winless with a 96-85 win in Boston’s home opener on Friday night.

O’Neal, nearly invisible in the first three games, and Pierce, who missed all of them with a bruised right heel, got the Celtics back in rhythm as they had their starting five intact for the first time.

O’Neal led Boston with 19 points after playing passively in totaling just eight points in the other games.

What was the difference?

“Playing extended minutes,” he said. “When you can get a rhythm, you can get a flow and you can get comfortable with what the team is doing. If you look at the first couple of games, I was in and out so fast that it was almost impossible to get any flow to the game.”

O’Neal was aggressive throughout, scoring 10 points in the first half, which ended with Boston on top 50-43. Then he scored seven in the third quarter when the Celtics outscored the Pistons 36-21 to take an 86-64 lead.

“He gave us a great lift, played with great energy,” Celtics Coach Doc Rivers said. “I thought he was really focused on setting picks and rebounding and doing all the little things.”

The closest the Pistons came in the fourth quarter was the 11-point final margin.

Pierce, who had taken part in just one Celtics practice, finished with 12 points. More than that, he brought a fiery attitude and helped the Celtics stay spaced properly on the floor. He drew defensive attention with his shooting ability, opening opportunities for teammates.

“It felt good to finally get out there,” Pierce said. “I was expecting to be me and I don’t settle for anything less. I worked tremendously hard. I did a lot of things. I did what I could do coming into the game, as much as I could, other than practice. I just stayed focused.”

Ray Allen and Brandon Bass added 17 points apiece for Boston. O’Neal, injured much of last season, his first with the Celtics, had seven rebounds, blocked two shots and sank seven of nine shots after making three of 12 in his first three games.

“Defensively and rebounding is how I’m going to judge myself,” he said. “That’s my role. I’ve heard people ask me, ‘Why would you accept it?’ But that’s what you do on a championship-caliber team.”

Greg Monroe had 22 points and nine rebounds, and Austin Daye scored 11 for Detroit (0-3).

“We just have to work and be a whole lot more efficient offensively,” said Detroit Coach Lawrence Frank, a Celtics assistant last season. “The beauty of Boston is everyone does their part. They all chip in. It’s never really a guy going for 35. They all kind of do their part. They were coming in with a sense of urgency.”

The Celtics haven’t started a season 0-4 since 1969-70 and were 0-3 for the first time since 2006-07.

“I don’t think we played particularly well in those three games, but one thing I know is we know how to play basketball,” Allen said. “We like who we have on our team. We knew we had to work harder.”