Humphries was given two technical fouls and ejected. Nets forward Gerald Wallace, who joined the fray under the Boston basket, was given one technical, but since it was his second of the game he was also sent off. Garnett was given one technical foul and remained in the game.
Rondo finished the night with three assists, ending his streak of 37 consecutive games with at least 10 that dated to March 11 of last season. That ties John Stockton for second-longest in NBA history. Magic Johnson holds the record at 46 consecutive games in the 1983-84 season.
The tussle started when Humphries fouled Garnett, pushing him to the floor as he shot from the right baseline. Rondo shoved Humphries, sending the skirmish into the stands. Wallace began shoving Garnett before the fight was broken up.
After reviewing the incident on replay, the referees gave Humphries two technical fouls and ejected him. Rondo was simply ejected.
The Celtics point guard has had a history of petulance, including a one-game suspension during the opening round of last year's playoff series against Atlanta after he chest-bumped referee Marc Davis while complaining about a call in the final minute of a Boston loss.
During the regular season, he was suspended for two games for throwing a ball at an official.