BOSTON – The Celtics remained undefeated and began the season with a 119-108 win over the Bucks at TD Garden on Monday night.

The hosts ended the tight affair at the start of the fourth quarter with an 18-2 run and secured the team’s fourth consecutive win at the start of the regular season.

Jaylen Brown led the way for the Celtics, scoring 21 of his team-high 30 points on a balanced scoring night for Boston, while six different players scored in double figures. The bright spot of the night for Boston, however, was Payton Pritchard, who scored a season-high 28 points on 8 of 12 from 3-point range in just 28 minutes.

Damian Lillard (33 points) and Giannis Antetokounmpo (30 points, 10 rebounds) gave the Celtics’ defense problems for most of the night, but Milwaukee couldn’t get Boston to win from distance. The Bucks only made xx threes in the win and scored xx of xx from downtown.

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The Celtics will now look to extend their road win streak at TD Garden to five with a four-game road trip beginning Wednesday night at Indiana.

Here are four takeaways from the Celtics’ win over the Bucks:

Payton Pritchard loosens up for the bench: With Sam Hauser (back) sidelined again, Pritchard once again did the heavy lifting for the second unit and put in one of the best halves of his career in the first 24 minutes. Pritchard led all players with 19 of his 28 points before halftime, shooting 7 of 10 from the field and 5 of 8 from 3-point range. Joe Mazzulla rewarded him with some extra playing time after the outstanding game. Pritchard’s offensive explosion was timely given Brown and Tatum’s early shooting struggles. Pritchard has now scored in double figures in three straight games after a miserable 1-of-10 shooting night in the opener. He also made five or more 3s in three straight games, missing his career high of eight 3s by just one point.

Jaylen Brown wakes up from the shooting funk: After a disastrous shooting night in Detroit (6 of 24 FG), Brown faltered for most of the first half, missing six of his first eight shots. However, Brown turned things around in the third period, repeatedly attacking the Bucks on the sidelines with minimal resistance, going 5 of 6. With 12 points, he led all scorers in the field and helped the hosts to a lead of 37:26 in the phase in which Boston gained control of the game. He ended up scoring 21 of his 30 points in the second half.

Jordan Walsh gets first chance in the rotation: The second-year winger played the first meaningful minutes of his Celtics career on Monday night when Joe Mazzulla brought him in late in the first quarter. With Hauser out and Boston’s two big bench lineups resulting in a disappointing offensive performance, it made sense to give the 20-year-old a chance after a solid preseason. It was a mixed bag for Walsh in his opening minutes as he did good work defensively, including a great boxout on Bucks center Brook Lopez and a great offensive rebound putback in the second half that Walsh failed to make them pay as he missed both of his wide open 3s. A healthy diet of those shots will be crucial for Walsh to convince Mazzulla that he deserves rotation minutes, even on the nights Hauser is available. However, Mazzulla had to like what he saw from Walsh from a performance perspective.

The Bucks seem a little too old to threaten the Celtics: It was obvious the Bucks were trying to do this from the start after suffering an ugly loss to the weak Nets on Sunday night. Despite a tough shooting night from Jayson Tatum and efficient nights from Damian Lillard and Giannis Antetokounmpo, Milwaukee just doesn’t look like they have the strength to withstand this Celtics team for 48 minutes anymore. The Milwaukee bench has largely been a sieve defensively and there simply aren’t enough reliable outside shots right now to make opposing defenses pay for packing the paint against Antetokounmpo. It’s still early in the year, but it’s hard to imagine Khris Middleton changing the endgame for this group as they’re banking on Lillard continuing to deliver disappointing results.