Boston ? There were still 20 seconds left in the game when Paul Pierce decided he didn’t need to see any more and headed to the locker room.

Boston Celtics forward Glen Davis (11) saves the ball from going out of bounds. At right is Orlando guard Jameer Nelson. Davis was pivotal off the bench, scoring 17 points, and the Celtics drilled the Magic, 94-71, to take a 3-0 lead on Saturday in Boston.

In the hallway, he repeated aloud: “One more. One more.”

Pierce helped the Celtics open a 16-point, first-quarter lead, then watched as Rajon Rondo and Glen “Big Baby” Davis helped Boston coast to a 94-71 victory over the Orlando Magic and take a 3-0 lead in the best-of-seven Eastern Conference finals.

The most-decorated team in NBA history, the Celtics are one win away from their second trip to the finals in three years — and their 21st in all. No NBA team has ever lost a playoff series after winning the first three games.

“We’re motivated for what’s at stake. We see the big picture,” said Pierce, who was the finals MVP when Boston won its record 17th NBA title in 2008. “We were coming home for two games on our home court. We’re motivated. We can feel it. Guys know what its like to win a championship and play for a championship.”

The Magic have to win Game 4 on Monday night to avoid a sweep and force the series back to Orlando. They’ll need a better effort than in Game 3, when they fell behind early for the third straight game. This time, they didn’t even mount a late charge to make it close.

“The most disappointing to me was that I didn’t have our team better ready to play,” said Magic coach Stan Van Gundy, who was himself knocked over late in the game when Kevin Garnett was pushed into the Orlando bench going after a loose ball. “It starts with me. It’s my job. I’m the coach of this team. It starts with me and I’m not happy with where we had our team tonight or anything I did.”

Pierce had 15 points and nine rebounds, Ray Allen scored 14 and Garnett added 10 points in just 24 minutes.

Davis scored 17 points, and Rondo added 11 points and 12 assists, and they also gave the team energy and defense that the Magic couldn’t match.