Lance Stephenson scored 25 points to help the Pacers past Philadelphia, who broke a franchise record by losing their 21st game in a row.
Russell Westbrook returned from a rest to add 17 points as the Thunder eased to another win on the road.
JJ Hickson recorded 21 points off the bench as the Nuggets prevented the Clippers from scoring in the final three-and-a-half minutes to secure the victory.
Williams made 11 of his 13 shots to score 28 points and help the Nets to their 10th successive win in front of their home supporters.
The Atlanta Hawks produced a strong display in the second half to beat the Charlotte Bobcats 97-83 at the Time Warner Cable Arena.
Despite trailing by six at half time, the Hawks were dominant in the final two quarters as Paul Millsap scored 28 points to help his side to victory.
Boston, who were behind for most of the contest, managed to reduce the deficit to one in the final minute but the Mavericks held on for their 41st win of the campaign.
Results in full: Atlanta Hawks 97-83 Charlotte Bobcats, Philadelphia 76ers 90-99 Indiana Pacers, Phoenix Suns 95-108 Brooklyn Nets, Oklahoma City Thunder 97-85 Chicago Bulls, Utah Jazz 86-124 Houston Rockets, Boston Celtics 89-94 Dallas Mavericks, Los Angeles Clippers 100-110 Denver Nuggets