The Celtics outlasted the Nets 125-124 in overtime from TD Garden.
Jayson Tatum led all scorers with 40 points including the game-winner as time expired in OT.
He also led all players with eight assists.
Boston remains undefeated at home after winning its third in a row.
Michael Porter Jr. led the Nets in scoring with 27 points.
Brooklyn is now 0-and-4 to start the season.
(Photo by Maddie Meyer/Getty Images)
Photo: Maddie Meyer / Getty Images Sport / Getty Images