BOSTON (Interstat) — Jayson Tatum made a 17-foot turnaround jumper at the overtime buzzer, and the Boston Celtics defeated the Brooklyn Nets 125-124 on Tuesday night at TD Garden.

Tatum finished with 40 points, five rebounds, eight assists and one block in 42 minutes. He shot 10 of 20 from the floor and 18 of 22 from the free-throw line. Paul George added 20 points, seven rebounds and seven assists for Boston. Derrick White scored 16 points with five rebounds and six assists, and Jordan Walsh had 15 points and six rebounds.

Michael Porter led Brooklyn with 27 points and 12 rebounds. Julius Randle scored 24 points with nine rebounds and four assists. Mikel Brown added 17 points, five rebounds and five assists. Moritz Wagner, Chaney Johnson and Nolan Traore each scored 15 points for the Nets.

Boston trailed 61-56 at halftime before moving ahead 86-82 after three quarters. The Celtics opened the fourth quarter with a 12-4 push and later took a 116-111 lead on Derrick White’s dunk and free throw with 33.7 seconds remaining in regulation. Brooklyn answered with Mikel Brown’s free throws and Julius Randle’s free throw before Brown made a 23-foot 3-point jumper with 1.0 second left to tie the score at 117 and force overtime.

In overtime, Randle made a two-point shot and a driving layup to give Brooklyn a 121-117 lead. Tatum answered with a layup, but Brown hit a 32-foot 3-pointer with 2:01 remaining to put the Nets ahead 124-119. Tatum made two free throws, and George made two free throws to cut the deficit to 124-123. Tatum then hit the turnaround jumper at the buzzer to complete the comeback.

Brooklyn shot 45 of 97 from the floor, 17 of 50 from 3-point range and 17 of 22 from the free-throw line. Boston shot 42 of 93 from the floor, 11 of 41 from 3-point range and 30 of 38 from the free-throw line.

Both teams had 11 offensive rebounds. Brooklyn had nine assists, seven blocks, 15 turnovers and 30 fouls. Boston had five assists, two blocks, 14 turnovers and 24 fouls. Brooklyn scored 124 points from 111 possessions, an offensive rating of 111.3. Boston scored 125 points from 114 possessions, an offensive rating of 109.6.

The Nets fell to 0-4. The Celtics improved to 3-1 and have won three straight. The game drew 19,156 at TD Garden. Brooklyn next hosts Detroit on Friday, while Boston hosts Chicago on Friday.

Interstat’s game simulator had projected a final score of Boston 112, Brooklyn 102. Interstat’s ELO system had projected Boston with a 97 percent probability to win. Boston had been installed as a pregame favorite with a spread of -11.5. The total score of 249 went under the over/under line of 222.5.