Williams had only 10 points on 3-of-7 shooting and Joe Johnson shot 4 of 14 for his 12 points.
"This one hurts. We didn't play our game. They beat us from the opening tip," Wallace said. "We didn't make shots. We turned the ball over too easy. Our defense just wasn't there tonight. We were not ourselves tonight."
Boston's Kevin Garnett had eight points and 10 rebounds on the day he tied Charles Oakley for 15th place on the NBA's career list with his 1,282nd game. He was also front and center when things got testy.
Wallace was fouled with 9:31 remaining and appeared to hold onto Garnett's uniform to balance himself and not fall. Garnett was fine with that but then objected to how long Wallace hung on to his shorts, and they said something to each other as they tried to push themselves free. That led to technical fouls on the two, along with Blatche and Courtney Lee.
Garnett said he asked Wallace what he was doing but got no response.
"I don't know where in America you can (yank) somebody's pants off, or shorts off. I don't know what the hell was going on," Garnett said.
Sullinger delivered a flagrant foul on Wallace a few minutes later, but there was nothing further.
In the Nets' Nov. 28 victory in Boston, Rondo, Humphries and Wallace were ejected.
It was the second quarter of that game where things got away from the Celtics, and Rondo's frustrations soon followed when he shoved Humphries after the Nets forward fouled Garnett. That ruined the point guard's chance to extend what was then a 37-game streak with double-digit assists, tied for second-longest ever, by finishing with three. He had five assists and six rebounds Tuesday.
This time, the second period belonged to the guys in green.
With the Celtics down three, Green had six points in a 10-0 run that made it 36-29. After Johnson's basket, Boston answered with a 13-3 spurt. Jason Terry made a 3-pointer before Rondo converted a three-point play to push the Celtics' lead to 49-34 with 3:56 to go.
The Celtics opened a 21-point lead early in the third quarter and cruised from there. Terry finished with 11 points.