BOSTON — The Celtics got into what was a 3-point shootout against the Trail Blazers, who were plenty hot on their own coming into the game. But Boston came up short in offensive firepower as it lost 129-119 to Portland on Sunday and TD Garden.

It was a 3-point barrage from tipoff Sunday as the teams combined for 142 points in the first half alone. Both teams refused to go too long without making 3-pointers, downing them in droves while also efficient from elsewhere. The Celtics finished shooting 51.3% on 3-pointers while the Trail Blazers were at 50% on plenty of volume.

Jayson Tatum turned in another solid game, pouring in 33 points, though he slowed down in the second half after a great first half. Evan Fournier was red-hot as he finished with 21 points, finally looking like his sharpshooting self. CJ McCollum had 33 points for the Trail Blazers while Damian Lillard had 26 points and 13 assists.

There are some injury concerns going forward as Tatum and Jaylen Brown appeared to be hurt on the same play late in the fourth quarter.

The Celtics have a two-day break before they’re back in action. They have a small two-game road trip, tipping it off by playing the Orlando Magic at 7 p.m. Wednesday at Amway Center.

Takeaways:

Tatum picked up where he left off: As if a career-high 60 points in an overtime win over the Spurs wasn’t enough, Tatum decided to go off again Sunday, at least in the first half. Tatum put up 24 points by halftime, the second straight game he had that many points by the break. He only scored seven points in the second half, though. Tatum saw and made open 3-pointers, but the 7-of-7 from the free throw line was another great sign. He averaged 7.3 free-throw attempts per game in April, showcasing he was attacking the basket more to earn easier points.

Fournier finding his groove: Fournier has slogged through some inefficiency in his brief Celtics stint, whether that was in his first few games or after coming back from COVID. He finally looked more comfortable Sunday, hitting his first seven shots in a row. It looked reminiscent of his outburst he had earlier this season, where he looked like he was finally getting comfortable with his Celtics teammates. That was the case again Sunday as he was finding his spots and made 8-for-10 of his field goals.

2020 first-round picks came to play: Payton Pritchard has exceeded expectations after being a late first-round pick; Aaron Nesmith has recently found his stride. Regardless of the path, the rookies combined for stellar games Sunday. They posted 29 points combined — Pritchard with 13; Nesmith had 16 — on 10-for-13 shooting as they showcased why Danny Ainge selected them in the first round. There were still some bumps: Nesmith is plenty aggressive on defense, but that means fouls. With the Celtics looking to solidify their rotation ahead of the playoffs, Nesmith and Pritchard are vying for larger pieces of the pie.

Celtics have an opportunity: The schedule opens up after Sunday’s game, leaving the C’s in an advantageous position over the next few games. They travel to face the Magic and Cavs — both teams who are at the bottom of the Eastern Conference standings. A pair of wins there would go a long way to keep pressure on the playoff race. The C’s wrap up their home schedule by playing the Heat twice after the brief road stint.