Indiana stayed hot Friday night, defeating Phoenix 97-91 in the first game the Pacers played since being snowed out of a Dec. 26 game against Chicago.
The Bulls have been idle since then, and saw Indiana's Central division lead grow to a full game over them.
George Hill scored 22 points to lead the Pacers (17-12) to their fourth straight win Friday. David West added 14 points and seven rebounds, as the Pacers have won seven of their last eight games.
The Bulls (15-12), meanwhile, have lost two straight heading into Saturday's game against Washington in Chicago.
Milwaukee's 108-93 win over Brooklyn Dec. 26 kept them even with Chicago at 15-12, as they host Miami Saturday.
Detroit (10-22) upset the Heat Friday, 109-99, and find themselves the winners of three of their last four games. Will Bynum had 25 points and 10 assists off the bench in the win. The Pistons will host the Bucks Sunday.
Cleveland's two-game winning streak came to an end with a 102-94 loss to Atlanta Friday. The Cavaliers (7-24) are at Brooklyn Saturday.