A fourth successive men's basketball title for the US is now within sight, but coach Popovich will know another shaky opening might be asking for trouble.
Here, as in the quarter-final against Spain, the American team went through the gears and eventually piled on the points.
They had trailed 41-26 with 5:23 to go in the second quarter, which was when Popovich called a timeout, having seen enough of his team being pulled this way and that by Patty Mills and the lively Boomers.
Dante Exum's dunk from Jock Landale's delicious assist gave Australia that 15-point cushion, but that was as good as it got for them.
From that point on, the game flipped, the US team going on a 48-14 run through to the end of the third quarter as they built a 74-55 lead, with Australia unable to get close enough to worry their opponents.
Kevin Durant led the USA with 23 points and nine rebounds, albeit making just one of seven three-point shots, while Devin Booker backed him up with a 20-point game.
The clash of France and Slovenia in the second semi-final later on Thursday would dictate whom Popovich must prepare his side to face next.
As well as four in a row, the USA are targeting a seventh men's basketball gold medal in the last eight Olympic Games, going back to the 1992 'Dream Team' triumph in Barcelona.