Jaylen Brown etched his name alongside Larry Bird’s in the Celtics record books Sunday night in Portland. But his milestone came in a losing effort.

Brown scored 37 points to tie Bird’s franchise record of nine consecutive 30-point games, but it wasn’t enough in a 114-108 loss to the Trail Blazers that snapped Boston’s four-game win streak.

The Celtics received limited offensive production from Brown’s supporting cast — Derrick White, Payton Pritchard and Sam Hauser combined for just 21 points and went 6-for-26 from 3-point range after scoring 73 in Friday’s victory over Indiana — and committed 19 turnovers, including four in the final 68 seconds.

They also struggled to contain 7-foot-2 center Donovan Clingan (18 points, 18 rebounds, seven offensive boards) and wing Deni Avdija (24 points, 10 assists, seven rebounds), who powered a Portland team that was playing without ex-Celtics Jrue Holiday and Robert Williams III, along with nearly a half-dozen other injured contributors.

Anfernee Simons, traded to Boston this summer in exchange for Holiday, went 4-for-11 and was a team-worst minus-15 in his first game back in Portland after seven seasons with the Blazers. He finished with 13 points.

The 19-12 Celtics will continue their season-long five-game road trip Tuesday in Utah (9 p.m. ET). The Jazz sit well below .500 at 12-19, but they’ve already beaten the C’s once this season, winning 105-103 on Nov. 3 at TD Garden.

Brown scored six points in the opening two minutes and 13 in the first quarter. The Celtics also were able to harass Portland into a slew of early turnovers — seven total in the first, plus another less than a minute into the second. Simons forced two of those after receiving a tribute video and an ovation from the Moda Center crowd, then drilling a 3-pointer on his first touch off the bench.

Boston had a difficult time matching up with Clingan, however. The former UConn star reached double-double territory midway through the second quarter by feasting on offensive rebounds and putbacks. His production in the paint, coupled with the Celtics’ own sloppy ball security, helped Portland build a 41-34 lead.

Foul trouble also forced Mazzulla into some early substitutions. He lifted Jordan Walsh for Hugo Gonzalez after the former was whistled for three fouls in the first 4:30 of game time.

As effective as Walsh has been since his mid-November promotion to the starting lineup, high foul counts have been an issue for the 21-year-old wing of late. Walsh also committed two in the first five minutes of a loss to the Pistons on Dec. 15 and two in the first three minutes of Friday’s win over the Indiana Pacers.

Gonzalez, who boasts the best plus/minus of any NBA rookie, wound up playing 14 first-half minutes and stuffing the stat sheet with eight points, three rebounds, two assists and two steals. His takeaways came in quick succession, and he punctuated the second with a fast-break dunk. On the next Celtics possession, Gonzalez drew a foul on an offensive rebound and made both free throws to tie the game at 41-41.

Brown reasserted himself as the first half wound down. He poured in 10 points in the final 2:09 before halftime, including a buzzer-beating stepback 3-pointer that put Boston ahead 63-55. Brown had 27 in the first half on 11-of-16 shooting, then matched Bird’s 30-point streak with a free throw at the 5:28 mark of the third. In so doing, he also leapfrogged Bill Sharman to move into 12th place on the Celtics’ all-time scoring list.

But the Blazers outscored Boston 31-22 in the third quarter, including an 11-3 run that featured back-to-back threes by Toumani Camara and a vicious putback dunk by Clingan over Luka Garza.

Garza, the Celtics’ second-string center, halted that run with a 3-pointer, but he picked up his fifth foul shortly thereafter, prompting Mazzulla to send in his first small-ball lineup of the game. With two guards and three wings on the floor, Simons proceeded to score eight straight points to quickly erase another seven-point deficit. Boston entered the fourth quarter down 86-85.

Trailing by three with 7:05 to play, the Celtics won a challenge to wipe out a Hauser shooting foul, then got rapid-fire threes from Hauser and Gonzalez to tie the game at 98-98. Gonzalez was the only Boston bench player to post a positive plus/minus in the loss, finishing with 13-6-5 and a plus-3 in 30 minutes.

Three minutes later, Brown was assessed a flagrant offensive foul on a hard drive to the basket, but Advija missed both free throws, and Portland came up empty on the ensuing bonus possession. A Neemias Queta dunk at the other end cut it to one with 3:22 to go. Shaedon Sharpe (26 points) and Brown then traded threes.

But Brown, with a chance to put Boston ahead, had his pocket picked by Sharpe with 1:08 remaining, leading to two Blazers free throws. White responded with a three, but two late miscommunications between him and Brown, coupled with one final second-chance bucket by Clingan, secured the win for Portland.