Maybe the Knicks should brawl more often.

Instead of falling apart following Wednesday’s Memphis fiasco, the Knicks were as sharp as any point this season and posted an upset in shutting down the powerful Pacers, 92-85, Saturday at Bankers Life Fieldhouse.

Marcus Morris, slapped for a $35,000 fine by the NBA for his role in the brawl and insensitive comments afterward, redeemed himself in one of his most clutch outings.

He hit three jumpers in the last 3:00 as the final daggers, scoring eight points total in that span. His final 16-footer stretched the lead to five points with 19 seconds left and he finished with 28 points on 10-of-21 shooting.

Morris spent a lot of time apologizing the past 48 hours and Saturday he did the winning.

“He’s been that guy for us,’’ Knicks interim coach Mike Miller said. “He has stepped up. He’s made big plays. He’s never backed away from anything. That’s who he is — high character. The big thing is how resilient they keep bouncing back.’’

Morris’ remarks about Jae Crowder after the brawl not only drew the NBA’s ire but the Knicks released a statement calling his comments “unacceptable and offensive.’’

“We defended really well against a really good team,’’ Morris said, declining to talk about his last 48 hours. “I came in locked in and wanted to get a win. We all played well. It’s a good win for us.”

In a big revelation, Dennis Smith Jr. was the starting point guard for the first time this season and played with poise — recording six points, six assists and three rebounds. Miller praised his defensive pressure, too. The forgotten man got 27 minutes as the trade deadline approaches Thursday.

“I felt good to get those minutes but mostly importantly, it felt good to get a win against one of the top teams in the East,’’ Smith said. “Twenty-seven minutes? You’re able to play through mistakes and the makes and misses.’’

Julius Randle scored 16 points with 18 rebounds and made one lovely, late pass for a Reggie Bullock layup when he maintained his dribble after nearly getting the ball stolen. Randle’s lazy pass, ironically, in the final minute led to a domino effect that started the ugly fight.

It was Miller’s second win over a club currently .500 or better (Miami the other) and moved his record to 10-18. The Knicks, who outrebounded the Pacers a whopping 57-34, are 14-36 overall.

Setting the tone early, the Knicks held the Pacers to 11 points in the first quarter — their best defensive performance in a period. It was also Indiana’s season low for a quarter. Then they buckled down again to hold Indiana to just 14 fourth-quarter points.

Ntilikina was forced to miss his second straight game with a groin issue and starting point guard Elfrid Payton was in the hotel room, suspended for the Pacers contest for his shove of Jae Crowder that ignited the Memphis melee.

That allowed the once-forgotten Smith to make his first start of the season.

One day after the one-year anniversary of the Kristaps Porzingis blockbuster, Smith played with confidence and pace, got into the lane and committed just two turnovers.

Then Smith hit two big jumpers early in the fourth quarter to repel the Pacers’ comeback. Kadeem Allen, their two-way G-League player, was the backup and showed the grit and poise he displayed late last season, even closing the game in the final three minutes.

Smith said he liked the combo with Allen, whom he calls his “big brother.’’

“He’s going to make sure I stay confident,’’ Smith said. “We got a lot of guys who believe in each other. That makes it a lot easier to play through mistakes.’’

Miller said before the game the brawl had not been a distraction or hurt unity.

“Not concerned at all,’’ Miller said. “It’s amazing, these guys the way that they’ve rallied around each other, the way they’ve stayed together. It really has been amazing this year. We had a great practice [Friday], the enthusiasm. We worked exactly on what we needed to do.’’

The Pacers have been sensational this season considering they haven’t had Victor Oladipo (ACL tear) all season until he made his debut Wednesday. He’s still rusty, under a minutes restriction and coming off the bench. He was 2-of-14 on Saturday.