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

The hosts broke open the tight affair early in the fourth quarter with an 18-2 run, earning the team’s fourth straight victory to open the regular season.

Jaylen Brown led the way for the Celtics by scoring 21 of his team-high 30 points in the 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 in just 28 minutes while going 8-of-12 from 3-point range.

Damian Lillard (33 points) and Giannis Antetokounmpo (30 points, 10 rebounds) gave the Celtics defensive problems for much of the night, but Milwaukee failed to make Boston pay from the perimeter. The Bucks hit just xx threes in the win and went xx-of-xx from downtown.

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The Celtics will now look to extend their winning streak to five away from TD Garden with a four-game road trip that begins Wednesday night in Indiana.

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

Payton Pritchard gets some slack on the bench: With Sam Hauser (back) sidelined again, Pritchard once again did the heavy lifting for the second unit, putting together one of the best halves of his career in the opening 24 minutes. Pritchard led all players with 19 of his 28 points before the break, going 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 eye-catching play. Pritchard’s offensive explosion came at the right time given Brown and Tatum’s early shooting. Pritchard has now scored double figures in three straight games after a miserable 1-of-10 shooting in the opener. He has also made five or more threes in three straight games, finishing with one fewer than his career-high eight threes.

Jaylen Brown stops shooting: After a disastrous shooting night in Detroit (6-of-24 FG), Brown floundered for much of the first half, missing six of his first eight shots. However, Brown turned things around in the third period, going 5-for-6 in the frame by repeatedly attacking the Bucks at the rim with minimal resistance. He led all scorers in the frame with 12 points and helped the hosts to a 37–26 lead in the period that gave Boston control of the game. He finished with 21 of his 30 points in the second half.

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

The Bucks look a little too old to threaten the Celtics: It was clear the Bucks were trying to do this from the start after an ugly loss to the lowly Nets on Sunday night. Even with a rough shooting night from Jayson Tatum and efficient nights from Damian Lillard and Giannis Antetokounmpo, Milwaukee doesn’t look like they have the horses to support this Celtics team for 48 minutes. Milwaukee’s bench has largely been a sieve defensively and there just isn’t enough reliable outside shooting at this point 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 while betting on Lillard continues to yield disappointing results.