The Hornets’ KJ Simpson (25) drives past the Celtics’ Drew Peterson (13) during the first half of an NBA game Sunday in Boston. Michael Dwyer/Associated Press

BOSTON — Payton Pritchard scored 34 points on Sunday and the Boston Celtics swept consecutive home games against the Charlotte Hornets with a 93-86 victory despite blowing a 21-point first-half lead in a regular-season ending matchup of all reserves.

Sam Hauser added 15 points for Boston (61-21), which begins the defense of its NBA title in the playoffs next weekend. Pritchard scored 12 in the final quarter.

Josh Okogie and Jusuf Nurkic each scored 14 points for the Hornets (19-63), who lost their seventh straight.

Neither team played any of their regular starters.

The Celtics played all their regulars Friday — except Jaylen Brown — and won by 36 points. Brown missed the final two games to rest his troublesome right knee that’s been bothering him for a month or so.

Charlotte’s Seth Curry didn’t play and finished the season hitting 45.6% on 3s. On Friday, he slipped ahead of Sacramento’s Zach LaVine and became eligible for the league’s top percentage by making his 82nd.

It was the second time this week the Celtics sat out their top six players. They also did in a 20-point loss at Orlando on Wednesday.

Takeaways

Hornets: Lost 12 of their final 13 and haven’t made the playoffs since 2016.

Celtics: Completed their second straight 60-win season, the first back-to-back since 2007-08 and 2008-09 when they won the title and lost in the East semifinals, respectively.

Key moment

Pritchard, a strong candidate for the NBA’s Sixth Man award, had nine points in the first quarter when Boston opened a 19-5 edge in the opening six minutes.

Key stat

Boston made 14 3’s, increasing its NBA record for a season to 1,457. The Celtics passed the previous high this month, set by Golden State two years ago.

Brown receives injections

Celtics coach Joe Mazzulla on Sunday confirmed a report that Jaylen Brown received injections during the week to help his troublesome right knee that’s limited his playing time the past month.

It was first reported by ESPN that Brown received pain management injections. The reigning Finals MVP sat out Friday’s victory over Charlotte and will miss Sunday’s regular season finale in the rematch against the Hornets.

“Just part of the rehab process for him to get back to be his absolute best,” Mazzulla said Sunday morning, when asked if Brown got any shots in his knee. “He’s continuing to take care of himself and put himself in great position to be ready for the postseason.”

In Boston’s run to the championship last spring, Brown was their main defender against the opponents’ top scorer.

Mazzulla said it was the player’s decision to sit out. In doing so, he became ineligible for postseason awards because he’ll be short of the league’s threshold for total games played.

“It was more, he makes that call,” Mazzulla said. “He knows his body better than anybody. He knows exactly where he’s at. He knows where he needs to get to in order to be at his best for what matters most. The most important thing is trusting him.”

Brown’s minutes had been decreased the last month or so as he tried to work through the injury.

When asked if he was confident Brown would be ready for the start of the playoffs, Mazzulla said: “A hundred percent.”