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 and posted 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).

“We talked about right from the start, how we want to finish the season, just take it step by step,” coach Tom Thibodeau said. “Obviously you start with all the things you can accomplish, qualifying is the most important thing, and then the highest seed possible.

“Now the next step is continue to play as well as we can to take that into the playoffs. Don’t change the approach.”

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.

Grimes contributed a career-best 36 points and Mitchell Robinson had 14 with 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.

“Going into the playoffs that’s the goal, that’s what we wanted. We want to make sure we all are just locked in.”

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

The Knicks embarked on a 17-0 run in the first quarter to take a 25-9 lead, before Toppin came up hobbling with what appeared to be a twisted ankle.

He remained in the game and flushed an over-the-shoulder feed from Grimes for a dunk toward the end of the quarter, although the Pacers drew within 38-29 through one.

Toppin finished the half with 19, with Quickley totaling 18 and Grimes added 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.