"It's tough. We're losing to teams that we're supposed to be beating," Gibson said. "That's the way I feel. I just feel like we have to do better, including myself. This one hurts."
The Bulls played without point guard Kirk Hinrich for the second straight game due to back stiffness. Coach Tom Thibodeau said he hopes Hinrich will be able to return soon.
Marquis Teague replaced Hinrich in the starting lineup, but Chicago's offense looked much better when Augustin was on the court. Augustin, who signed with the Bulls on Friday and started the second half, had eight assists in 37 minutes, while Teague was scoreless in 11 minutes.
Thibodeau said he thought about starting Augustin, but he wasn't sure if he was comfortable enough with the Bulls' schemes.
"I didn't want him to be tentative," Thibodeau said. "I thought he was much more aggressive. I liked the effort that he put in defensively. I think there are things he can do better, but I thought he made great effort and I think that's important."
Davis injured his shoulder in the fourth quarter of Orlando's 101-98 loss at Oklahoma City on Sunday. He was a game-time decision against the Bulls, but he made two big jumpers in the final period while playing 33 minutes.
"I'm just proud of our guys, to go back home with a win," he said.
Davis said his shoulder loosened up during the game and he just tried to give it everything he had. He also said he wanted to play against Bulls forward Carlos Boozer.
"I like playing against Boozer. He really fires my engine," Davis said with a wry grin. "Just his whole attitude really gets under me."
NOTES: Magic rookie Victor Oladipo, who played his college ball at Indiana, received a warm ovation when he was introduced with the starting lineup. ... The Bulls waived G Mike James before the game. He played 37½ minutes over seven games with Chicago. ... These teams play again on Jan. 15 in Orlando and April 14 back in Chicago. ... Boozer had six points on 3 -for-10 shooting to go along with 13 rebounds.
Jay Cohen can be reached at http://www.twitter.com/jcohenap