INDIANAPOLIS — The Knicks began playing out the final three-game string of the regular season Wednesday night, taking advantage of the luxury of resting top players while they await their first round playoff series against the Cavaliers.

Playing without their three leading scorers, the fifth-place Knicks did something they hadn’t accomplished offensively in more than 44 years in posting their fifth straight victory, 138-129, over the out-of-it Pacers at Gainbridge Fieldhouse.

Immanuel Quickley, Quentin Grimes and Obi Toppin gave the Knicks three 30-point scorers in one game for the first time since March 24, 1979 (Ray Williams, Earl Monroe and Toby Knight).

“Anytime someone’s out it’s an opportunity for someone else to step in. All these guys have had really good moments throughout the year,” Tom Thibodeau said. “The thing that I’m most proud of is the way that they improved throughout the year.

“To think about how we started, where we were to where we are today, it’s a tribute to them, to our players, for working together and not skipping over things. Put the work in each and every day.”

Without Julius Randle (sprained left ankle), Jalen Brunson (right hand maintenance) and RJ Barrett (non-COVID illness), Quickley led the Knicks (47-33) with 39 points and Toppin had 32 while making his third straight start in place of Randle.

He bested his season-high of 21 from the previous game against the Wizards.

“We just did a lot of the right things, moving the ball, playing in transition, playing a lot faster, Toppin said. “We were having fun out there.”

Grimes contributed a career-best 36 points and Mitchell Robinson dominated the paint with 14 points, 16 rebounds and seven blocked shots for the Knicks, who will play Friday in New Orleans and at home Sunday against the Pacers before getting five or six days off before Game 1 against the Cavaliers.

Want to catch a game? The Knicks schedule with links to buy tickets can be found here.

“I wish we didn’t have a long break,” said Josh Hart, who added six points, 12 rebounds, seven assists and four steals in his first start in 23 appearances since a Feb. 8 trade from Portland. “I feel like we’re going in the right direction. So your last three games, you continue to build habits and continue to grow, continue to get better.”

Jalen Smith scored 19 points to lead the eliminated Pacers, who played without All-Star point guard Tyrese Haliburton, among others.

Toppin finished the first half with 19, with Quickley totaling 18 and Grimes adding 16 as the Knicks took a 70-67 lead into halftime.

Toppin’s lobbed slam from Hart boosted the lead to 14 in the final minute of the third before the Pacers retook the lead with a 19-1 outburst bridging the final two quarters.

But two more transition dunks by Toppin put the Knicks up 124-120 with 3:43 remaining, joining Quickley and Grimes in the rare 30-30-30 club.

“I’m trying to think. What was going on in 1979? Was there even cable [TV]?” Quickley said. “That’s great stuff, I’m really happy, especially for those guys, because they work really hard. And especially Obi, good to see him get some success, especially down the stretch.”