Jaylen Brown drives against Orlando’s Hassani Gravett during Boston’s 116-111 overtime win Sunday night at TD Garden. Mary Schwalm/Associated Press

BOSTON — Jaylen Brown scored a career-high 50 points, rallying the Boston Celtics from 14 points down late in the fourth quarter to a 116-111 overtime victory over the Orlando Magic on Sunday night.

Brown scored 21 in the fourth quarter, then opened OT with his fifth 3-pointer of the game. Brown, whose previous career high was 46 against the Knicks on Oct. 20, also finished with 11 rebounds as the Celtics won their second in a row after three straight loss.

“We needed to win. No way we could have lost this game. It wouldn’t have been good,” said Brown, who made 9 of 12 shots in the fourth quarter while leading the Celtics on a frenzied comeback.

Marcus Smart added 17 points, seven assists and seven rebounds for the Celtics, who needed an 11-2 run down the stretch to force overtime. Dennis Schroder had 21 points and seven assists.

“We let the game come to us,” Smart said. “It wasn’t pretty. It was a little ugly. But we came out with the win and that’s because we kept our composure and we kept with it.”

Terrence Ross scored 33 for the Magic, who outscored Boston 35-20 in the third quarter. They closed the quarter on a 20-4 run to take a 77-65 lead into the fourth and were ahead 96-82 with a little more than 4 minutes remaining in regulation.

“Everybody was just going extreme tonight. We were playing with a lot of energy, a lot of hustle,” Ross said. “Any time you play like that, you’re going to give yourself a good chance.”

After missing the free throw on a three-point play attempt with 1:40 left, Brown drove for a layup to tie it at 98-all with 38 seconds to go. He added another layup that briefly put Boston up 100-98 with 30 seconds remaining, but Tim Frazier tied it up again and the game was decided in overtime.

“We’ve just got to shake it off and learn from the situations that we were in, because we’ll find ourselves in more of these as the year goes on,” Orlando Coach Jamahl Mosley said.

Both teams were without their top scorers. Cole Anthony was out for the Magic because of a sprained right ankle, and Boston’s Jayson Tatum missed his fourth straight game after being placed on the COVID-19 health and safety protocols list last week.

Gary Harris scored 23 points and Wendell Carter Jr. finished with 15 points and 16 rebounds for Orlando. Frazier scored 11 of his 14 points in the third quarter.

The Celtics led 45-42 at halftime despite committing 14 turnovers and nearly letting a 14-point lead vanish before the break.

“We got a little careless there. We were playing really fast and a little reckless at times and let them get back into the game, but overall we showed growth,” Boston Coach Ime Udoka said. “We’ve lost quite a few of those this year and got out there defensively and got what we wanted towards the end of the game.”

Brown said he wasn’t aware he was headed toward a career night, too caught up in the pace of the rally to realize how much he had scored until the final minute.

Brown is the seventh player in team history to score 50 and the fourth Celtic to reach 50 points and 10 or more rebounds in a game, joining Tatum, Larry Bird and Kevin McHale.

“My teammates found me tonight and I knocked some shots down,” Brown said.

TIP-INS

Magic: Orlando had just four turnovers in the first half. … Mo Bamba was back after missing seven games because of health and safety protocols. … Guard Hassani Gravett returned after missing one game because of safety protocols. … Center Robin Lopez remained on the protocol list.

Celtics: Center Robert Williams, who had his first career triple-double Friday with 10 points, 10 assists and 11 rebounds in a win over Phoenix, was out because of a sprained right big toe. … Although Tatum’s status was bumped up to “reconditioning to return to competition,” he remained out of the lineup. … Schroder returned after missing four games on the protocols list. … Guard Romeo Langford was out because of a non-COVID illness and guard Brodric Thomas was out because of lower back pain. … Center Enes Freedom is still on the protocol list.