Dallas won despite Oklahoma City's Russell Westbrook recording his 12th triple-double of the season with 38 points, 15 rebounds and 11 assists. The Thunder had been 11-3 in December before consecutive home losses to Milwaukee and Dallas to end the month.
Paul George scored 25 points and Carmelo Anthony had 21 for Oklahoma City, combining to go 8 of 14 from 3-point range. Despite their hot shooting, Westbrook took the big shots late for OKC and missed a trio of 3-pointers in the final 30 seconds. He was 0 for 4 from deep for the game.
Marcus Morris added 15 points, Terry Rozier scored 14 and Jaylen Brown finished with 13 points as Boston closed 2017 by winning three straight and four of five.
Rondae Hollis-Jefferson had 22 points and 12 rebounds and Caris LeVert scored 16 for the Nets, who could not overcome 10 turnovers in the second half.
The Celtics won their seventh straight against the Nets, although Boston didn't have the game in hand until Irving made a pair of free throws with 7.7 seconds remaining. Boston went the final 4:27 without a field goal and struggled from the foul line, going 13 of 21 in the second half and missing several opportunities to put Brooklyn away.
Beal scored 15 straight points for Washington in the fourth as the Wizards rallied from an eight-point deficit early in the period. He also had nine rebounds and tied a career high with nine assists.
Nikola Mirotic scored 21 points to lead Chicago, which had won 10 of its previous 12. Kris Dunn had 19 points and 11 assists.
David Nwaba's two free throws with 1:26 to play gave Chicago a 108-107 lead, and Dunn hit a jumper with 54 seconds remaining.
John Wall's three-point play with 29.4 seconds left put the Wizards up 112-110. After Beal missed two free throws, Washington got the rebound and Wall added two free throws with 9.1 seconds to play.
Joel Embiid added 22 points and nine rebounds, and Ben Simmons had 21 points to help Philadelphia win for third time in four games.
Devin Booker scored 28 of his 32 points in the second half for the Suns, and T.J. Warren had 28.
The Sixers came close to dropping their seventh game in which they have led by 11 points or more. But J.J. Redick made a 3-pointer with 1:31 to play for an insurmountable 119-108 lead. Redick had 22 points.
Phoenix trailed 73-55 with 9:20 left in the third quarter and went on a 32-11 run to take the lead before the quarter ended.
Karl-Anthony Towns had 18 points, 14 rebounds and six blocks, and Taj Gibson added 17 points and nine rebounds for the Timberwolves (23-14), who have won nine of the last 12 games.
Joe Young scored a career-high 20 points and Bojan Bogdanovic scored all of his 13 points in the third quarter as the Pacers (19-18) dropped their fourth straight, equaling their worst skid of the season. Indiana also lost four in a row in early November.
This time, the Pacers have been without guard Victor Oladipo, who averages a team-leading 24.9 points per game. He missed a third straight game with an injured right knee.
Grizzlies 114, at Kings 96: Evans had 26 points, seven rebounds and five assists against his former team and the Grizzlies beat the Sacramento Kings 114-96 on Sunday.