Don Nelson's return to the sidelines proved to be a sour one, as the Mavericks lost for the first time in 13 games against the Chicago Bulls 107-100.

A plus 16 rebound margin, and an off shooting night by Dirk Nowitzki and Michael Finley proved to be more than the Mavericks could handle.

"We shouldn't be losing to these Eastern Conference teams," Dirk Nowitzki said to ESPN after the game. "It's something I didn't think could happen. We've got to protect our home court better than that."