(5-10) led by 2 after three quarters, but Boston (11-4) outscored them, 28-20, in the final 12 minutes.
Paul Pierce scored 18 points and Ray Allen had 15 for the Celtics, who lost guard Delonte West to a broken right wrist.
The Nets were led by Devin Harris, who had 20 points, and Anthony Morrow, who added 18.
MAGIC 104, HEAT 95 had 24 points and 18 rebounds, and J. J. Redick scored 20 points as host Orlando sent Miami to its third straight loss by avenging a 26-point loss at Miami earlier this season.
had 25 points, Chris Bosh finished with 21 and Dwyane Wade scored 18 for Miami.
111, THUNDER 103 scored 34 points, Tyson Chandler had season highs with 17 points and 18 rebounds, and visiting Dallas charged past Oklahoma City in the fourth quarter.
Nowitzki and Jason Terry teamed to score 10 straight points in a 57-second span to put Dallas up for good midway through the final period, and the Mavericks sealed it with a 12-0 run.
Kevin Durant had a team-high 32 points for Oklahoma City, which had a five-game winning streak snapped.
113, 109 Manu Ginobili scored 14 of his 26 points in the fourth quarter to rally San Antonio from 21 points down for its 12th straight victory, in overtime over host Minnesota.
Kevin Love had 32 points and 22 rebounds for the Timberwolves.
83, 81 Mo Williams made a 15-foot jumper over Milwaukee’s as time expired to help host Cleveland snap a three-game skid. Williams finished with 25 points against his former team.
IN OTHER GAMES Derrick Rose scored 35 points as Chicago beat host Phoenix in double overtime, 123-115. … Deron Williams had 26 points and 11 assists as host Utah beat New Orleans, 105-87, sending the (11-3) to their second straight loss. … Andrea Bargnani scored 24 points and Reggie Evans had 20 rebounds as host Toronto extended its winning streak to four games by beating Philadelphia, 106-90. The are 1-8 on the road. … Zach Randolph had 21 points and 14 rebounds as host Memphis beat Detroit, 105-84. … Kevin Martin scored 25 points and host Houston held off foul-prone Golden State, 111-101, to snap a four-game losing streak. Golden State has lost six of seven.