OKC led by one going into the fourth, but Memphis came out on top 122-114 in a high-scoring contest as recent acquisition Mario Chalmers scored 16 of his season-best 29 in the final frame. Russell Westbrook had 40 points and 14 assists in defeat for the Thunder.
Manu Ginobili scored 14 of his 17 points in the fourth quarter to help the Spurs pull away and remain unbeaten at home this season.
It was all square at half time, but the Celtics outscored the Rockets 32-13 in the third frame on their way to a third straight win that sees them improve to 5-4.
Point guard Knight had 30 points, 10 rebounds and 15 assists as Phoenix improved to 6-4 and inflicted a ninth defeat in 11 games this season on the Lakers.
Jimmy Butler made a last-second block on Paul George to ensure victory for the Bulls, whose point guard Derrick Rose was their top scorer with 23 points but left the game with an ankle injury midway through the fourth quarter.
Philly have now lost 21 straight regular-season games including the end of last season after Dirk Nowitzki (21 points) helped the Mavs pull away down the stretch.
Results in full: Dallas Mavericks 92-86 Philadelphia 76ers, Indiana Pacers 95-96 Chicago Bulls, Boston Celtics 111-95 Houston Rockets, Oklahoma City Thunder 114-122 Memphis Grizzlies, Portland Trail Blazers 80-93 San Antonio Spurs, Los Angeles Lakers 101-120 Phoenix Suns