Pierce had a chance to win it in regulation, but his 19-footer at the buzzer rimmed out.
Alec Burks‘ reverse layup pulled Utah to 108-105 with 37 seconds left in overtime. Kevin Garnett’s banked 3-pointer with 13 seconds left came after the shot clock expired, giving the Jazz another chance.
Paul Millsap was fouled before he could get off a 3, but made two free throws with 4.2 seconds remaining.
Avery Bradley added a season-high 18 points for Boston.
The Celtics (30-27) were playing their fifth game in seven days, but didn’t seem to care down the stretch.
The Jazz (31-25) led 101-99 in overtime on DeMarre Carroll’s 21-footer, but Pierce countered with a 3-pointer, then followed with a pull-up jumper over Carroll and a 15-footer to give the Celtics a 106-101 edge with 1:12 left.
The Jazz trailed by eight entering the fourth but opened on a 13-2 run.
Jefferson’s 10-foot turnaround jumper over Brandon Bass tied it at 93 with 2:46 left in regulation.
The game took a 16-point swing in the third, as Boston trailed 58-50 only to counter with a 20-4 run and lead 80-72 entering the fourth.