The Cleveland Cavaliers clinched a narrow win over the Indiana Pacers to make sure that they will be featuring in this season's playoffs.
Russell Westbrook added 17 of his 36 points in the fourth quarter to put the Thunder ahead, leaving the Eastern Conference leaders with back-to-back defeats.
The NBA champions never trailed as they shared the workload, with five players finishing in double points, despite the Celtics cutting the gap by nine points in the final 12 minutes.
Chris Paul ensured that the hosts had an early advantage, while the remaining three quarters were closely matched, ensuring that the Wizards could not recover from the Clippers' quick start.
Rookie Nikola Mirotic came off the bench to add 29 points, giving the Bulls a big enough lead to see out the win while handing Toronto a third straight loss.
Having added just 44 in the first two quarters, Memphis added 39 in the third quarter to surge ahead, led by Zach Randolph who finished with 21.
The Heat were up by 15 midway through the third, while Dwyane Wade continued his recent good form to cancel out Denver's attempts to close the gap.
Rudy Gay led the charge for the hosts, finishing the game with 33 points to cost the Hornets their spot in the Eastern Conference playoff places.
The visitors were three points ahead early in the final period, but Elfrid Payton led the comeback, inspiring a 20-8 run that put the Magic back in front.
The Bucks had been 14 points up early in the second half, but Brook Lopez got them back on level terms before finally putting them ahead for good in the third overtime period.
Nerlens Noels added a career-high 23 points to set up Philadelphia's fourth win in seven, leaving them three wins clear of the Knicks.
Results in full: Portland Trail Blazers 104-111 Orlando Magic, New York Knicks 81-97 Philadelphia 76ers, Milwaukee Bucks 127-129 Brooklyn Nets, Indiana Pacers 92-95 Cleveland Cavaliers, Denver Nuggets 91-108 Miami Heat, Toronto Raptors 92-108 Chicago Bulls, Atlanta Hawks 115-123 Oklahoma City Thunder, Memphis Grizzlies 112-101 Dallas Mavericks, Boston Celtics 89-101 San Antonio Spurs, Charlotte Hornets 91-101 Sacramento Kings, New Orleans Pelicans 96-112 Golden State Warriors, Washington Wizards 99-113 Los Angeles Clippers