BOSTON — Josh Richardson scored a season-high 27 points, Jayson Tatum had 25 and the Boston Celtics beat the New York Knicks 114-107 on Saturday night with each team missing six players because of COVID-19 protocols.

Jaylen Brown added 23 points for Boston. After blowing a 15-point halftime lead, the Celtics won for just the second time in their last six games.

“Being off mentally for five days was obviously good for me,” said Richardson, who was also on COVID protocol this month. “I was pushing myself when I was out. I was thankful to get those negative tests quickly and come back.”

Evan Fournier, who played with Boston last season, matched his season-high with 32 points for the Knicks. New York has lost five of six.

Kemba Walker, who also played with Boston the last two seasons, started for the Knicks and scored a season-high 29 points before fouling out. He was benched after starting New York’s first 18 games and didn’t play in the last 10. Julius Randle added 20 points and seven rebounds.

“If I’m not starting, I ain’t playing,” Walker said about his lack of time on the court. “It is what it is. I’m here for my team, I’m here for my teammates. That’s what I’m here for.”

“He played well. That’s what he’s supposed to do,” Knicks Coach Tom Thibodeau said of Walker. “He’s a pro. Great character. Played well.”

Richardson’s 3-pointer early in the final quarter gave Boston the lead for good, 91-89. The Celtics made it 104-97 on Tatum’s three-point play with 5:35 to play.

The Knicks kept it a two-possession game until Robert Williams III had a dunk, making it 109-102 with 3:14 left. Richardson’s 3 from the left corner sealed it with 32.6 seconds left.

Trailing by 15 at halftime, the Knicks opened the third with a 23-5 run and took their first lead of the night on Walker’s 3 from the right wing. They led 88-86 entering the fourth.

“We just had a little lapse there and picked it up where we left off in the first half,” Celtics Coach Ime Udoka said. “A few mistakes there, but overall three great quarters of defense.”

Boston starting center Al Horford and forward Grant Williams were sidelined because of health and safety protocols along with four other teammates. Immanuel Quickley and RJ Barrett are in protocol with four other Knicks.

The Celtics, who had little resistance from the Knicks’ defense in the opening half, led by 14 after one quarter and pushed it to 62-47 at halftime.

TIP-INS

Knicks: Guard Derrick Rose was sidelined because of a right ankle injury he sustained in the last game. … Randle, their leading scorer at 19.6 per game, was scoreless in 10 minutes in the opening quarter. His initial basket came on a 3 midway into the second. … The Knicks had a 41-point third quarter. … Fournier played 16 games with the Celtics last season after coming over in a trade from Orlando.

Celtics: Guard Dennis Schroder was sidelined because of a non-COVID-19 illness. … Guard Romeo Langford was also sidelined because of neck pain from a hard foul from Golden State’s Andrew Wiggins in Friday’s loss. Coach Ime Udoka said Langford was checked and didn’t have a concussion … Boston signed Justin Jackson to a 10-day contract. The 26-year-old forward played with four NBA teams and was with the Texas Legends in the G League.

OTHERS SIDELINED

Boston’s Sam Hauser was placed in protocol Friday, forwards Jabari Parker and Juancho Hernangomez landed in earlier in the week, and Brodric Thomas went in on Saturday.

New York’s Obi Toppin, Kevin Knox and Quentin Grimes are in protocol. Barrett, Toppin and Grimes all missed Thursday’s win over Houston. Miles McBride went in on Saturday.

MIXED VIEWS

Walker was greeted with a mixture of boos and cheers during pregame introductions. There was a spattering of cheers when he nailed his first basket – a 3-pointer – early in the opening quarter and when he scored throughout.