The win was Boston’s fifth in six tries. The Celtics moved into a tie with the Philadelphia 76ers atop the Atlantic Division.
Former Celtic Al Jefferson had 18 points and 12 rebounds for the Jazz, scoring 10 in a 17-3 third-quarter run that turned an 18-point deficit into a two-possession game. The Jazz tied it early in the fourth before Boston scored the next seven points — with Garnett contributing on all of them — to pull away.
Utah had won seven of its previous eight games.
Gordon Hayward scored 19 points, and Paul Millsap had 16 for the Jazz, who fell into a three-way tie with Denver and Houston in a race for the last two playoff spots in the Western Conference.
The Celtics took a 44-29 lead with 2:22 left in the half on consecutive alley-oops from Rondo to Ryan Hollins. Boston opened an 18-point lead, 61-43, with 7:40 to play in the third quarter.
But the Jazz scored 17 of the next 20 points — 10 of them from Jefferson — to make it a four-point game. They then ran off six in a row to tie it 66-all, scoring the first five of the fourth quarter on Enes Kanter’s jumper and a three-point play by Alec Burks.
That’s when the Celtics snapped out of their slump.
Garnett fed Keyon Dooling for a 3-pointer, then the Celtics’ big man made a fallaway jumper. After a Jazz miss, Garnett grabbed the rebound and made an outlet pass for a fast break that ended with Bradley at the free throw line, sinking a pair of foul shots that made it 73-66.
The Jazz never got closer than three points after that.
Notes: Ray Allen missed his fourth consecutive game with a sore right ankle … Celtics F Chris Wilcox is scheduled to have surgery for an enlarged aorta on Thursday. … Pierce made seven free throws to give him 6,041 in his career and pass David Robinson for 15th place on the NBA’s career list for free throws made. Next up: Wilt Chamberlain at 6,057. … Jefferson and Garnett drew matching technical fouls with 6 minutes left. … Jefferson, who was traded to Minnesota in the 2007 deal that brought Garnett to Boston, was 1 for 8 from the floor in the first half.