The younger Rivers acknowledged that it might not be so fun for his dad.
"He has to balance more than I do," Austin Rivers said. "I just have to go out there and play my best and help my team win, where as he has to go out there and try to game plan against me and then he wants to be happy for me at the same time. So he kind of has a double-edged sword for him, whereas for me I just go out there and play.
"I'm sure he doesn't really like all this, so I know he's waiting for this night to be over with, whereas for me, I'm waiting for it to get started."
The two spoke briefly during pregame warmups, and Austin Rivers got a big cheer from the opposing crowd when he checked into the game with 4:19 left in the first half. Doc Rivers leaned back to say something to the assistant coaches sitting behind him and cracked a brief smile.
Austin Rivers spent much of his first stint on the court staking out a position on the right side, which placed him in front of the Celtics' bench; there was no interaction with his father's team. With about a minute left in first quarter, he muscled a hook shot in for a basket, but his father had no reaction.
Austin Rivers finished with eight points in 22 minutes.
Austin Rivers, who said he has been able to beat his father one-on-one since the eighth or ninth grade, said it was easier because his dad wasn't on the court.
"It's not as crazy as it seems, 'cause he's a coach," he said. "I'm not playing against him, you know, he's just coaching. It would be one thing if he was somehow still playing."