Ray Allen led Boston with 14 points, including two 3-pointers, while Glen `Big Baby' Davis and Semih Erden both had 13 points.
But it was "The Diesel's Debut" that grabbed much of the attention.
"I'm just trying to get into it with the guys," he said. "Just trying to stay a thousand percent healthy, because, in a couple a weeks, you know, it's for all the marbles."
The Celtics, who lost an epic Game 7 of the NBA finals to the Los Angeles Lakers, returned coach Doc Rivers, who considered retirement, as well as Allen and Paul Pierce -- both of whom could have left via free agency.
"I didn't really know what to expect," Rivers said. "Our defense was phenomenal."
The Celtics signed the large O'Neal -- Shaquille -- along with Jermaine O'Neal and Delonte West, hoping to add depth to a bench that will need to offer support for aging stars Kevin Garnett, Pierce and Allen.
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