Marcus Smart described the Boston Celtics' performance against the New York Knicks as a "thing of beauty" after they broke a franchise record on Saturday.

The Celtics drained 27 three-point attempts in their 133-118 victory against the Knicks, the most they have ever managed in a single game.

As usual, it was Jaylen Brown (30 points) and Jayson Tatum (26) who led the way in scoring, while Smart added 13 of his own, including hitting three from five attempts from beyond the arc.

"It felt amazing," Smart said after the win that put the Celtics on 6-3 for the season. "[Head coach Joe Mazzulla] was just preaching to us, 'Don't get tired, we're playing the right way.' I think every coach preaches that, but to see it actually happen in action is a thing of beauty.

"It's good for us. It felt good for guys to hit shots, felt good for the team to see how we play when we play that way and the things we can do, so we have to keep preaching that, we have to keep working."

It was a productive night for Boston at Madison Square Garden, needing just 41 attempts for their record 27 three-pointers, and shooting 53 per cent from the field overall.

Sam Hauser played his part from the bench, scoring five threes in just 21 minutes, going some way to justifying his full contract signed with the Celtics in the offseason.

"Once you get the first couple to go it opens it up a little bit," Hauser said. "I definitely had a lot of confidence tonight and I think I'm getting my feet under me and getting more comfortable knowing these guys and where I'm supposed to be. So I'm just going to keep playing off them and doing my part."