BOSTON --Jaylen Brownscored 14 of his 31 points in a pivotal third quarter, and theBoston Celticsrallied to beat theOklahoma City Thunder119-109 on Wednesday night, snapping the defending champions' 12-game win streak.

Jayson Tatumrecovered from back-to-back rocky performances to contribute 19 points, 12 rebounds and seven assists as Boston earned a split in the two regular-season matchups between the past two NBA champs.

Brown added eight rebounds and eight assists, and his big quarter helped the Celtics take an 88-83 lead into the fourth. Boston's edge grew as high as 14 in the final period.

OKC got within six with 1:30 remaining, but a layup by Brown and two free throws byDerrick Whitehelped Boston close out Oklahoma City's first loss since Feb. 25.

"I really wanted that win," Brown said. "That was well needed. We needed that as well. We know we can play with anybody, but when you get a win on your home floor against the team that has the best record in the league, it feels good, especially after dropping the game I feel like we should have won against Minnesota (a 102-92 loss Sunday). Very encouraging and it's a step in building the right direction."

Shai Gilgeous-Alexanderled the Thunder with 33 points and eight assists. It was his seventh straight 30-point game against Boston, the longest streak vs. the Celtics since LeBron James had nine straight from 2004 to 2008. But Oklahoma City was outscored by the Celtics 19-2 in second-chance points and shot just 12-of-37 from the 3-point line.

Lu Dortadded 14 points.Jalen Williamsfinished with seven points in his second game back following a 16-game absence with a hamstring injury.

The Thunder earned a two-point victory in the first meeting between the teams two weeks ago in Oklahoma City. But that game was played with both sides missing key players.

The Celtics were without Tatum, who hadn't returned from Achilles tendon rehab, White (bruised right knee) andNikola Vucevic(finger). Oklahoma City didn't have Williams (strained right hamstring) orIsaiah Hartenstein(bruised left calf).

Vucevic again sat Wednesday, but the other four were on the floor for the rematch in a rare late-season pairing of elite NBA teams still with things to iron out before the playoffs. The Thunder entered atop the West and with the NBA's best record, while the Celtics came in boasting the East's second-best mark.

It marked the Celtics' first win against a team that entered 40-plus games over .500 since March 8, 2017, against theGolden State Warriors.

"I like the fact that we brought the physicality," Boston coach Joe Mazzulla said. "I like the fact that we brought our offensive organization. I like the fact that we executed. I like the fact that we took it to a different level defensively. And so now it's OK, where can we get better? How do we apply it to Friday's game (against the Hawks)? They're playing really well, they're going to challenge us in different ways, and how do we get better?"

Information from EasyChamp and The Associated Press was used in this report.