Duncan missed his fourth straight game due to a sore left knee. Ginobili was out for the fifth consecutive game with tightness in his left hamstring.
"For sure it was a great win for us," said center Tiago Splitter, who had 16 points in 33 minutes despite an awkward fall in the first quarter. "We hope all the guys get better and healthy again soon and ready to help us."
The injuries for All-Stars Parker and Duncan, plus key scorer Ginobili, meant San Antonio's three best players were reduced to a cheerleading role for the night, and their teammates gave them plenty of reasons to stand and applaud.
Gary Neal also had 16 points for San Antonio (41-12), which improved the league's best road record to 19-10. Nando De Colo, subbing for Parker, had nine points and seven assists in his second career start.
Luol Deng finished with 11 points and 11 rebounds for Chicago (30-21), which dropped to 15-12 at home this season.
"We didn't make shots down the stretch and we couldn't get stops for some reason," Robinson said. "They have the best record in the NBA for a reason."
NOTES: Thibodeau said he thinks G Kirk Hinrich (right elbow) will travel with the team to Boston for Wednesday's game against the Celtics. Hinrich hasn't appeared in a game since Jan. 30 at Milwaukee. ... Splitter had a big bag of ice on his left ankle after the game. "It's painful right now, but we'll see tomorrow how it feels," he said. ... Deng addressed the crowd before the game and said he is looking forward to representing the Bulls at Sunday's All-Star game in Houston. ... Diaw and Splitter are the only players to appear in all 53 games for the Spurs this season.
Jay Cohen can be reached at http://www.twitter.com/jcohenap