Serbia made 15 threes in the first 3 quarters, and made 0 in the fourth.
They fell apart when the US took the lead. Lots of bad decisions after that. Backcourt violation, bad pass and Curry steal-lay-up, waited forever to foul, and basically dribbled the clock out.
I think the turning point was Durant’s made 3 and Jokic getting his 4th foul at the same time. US got the ball right after that made three and foul, then Booker immediately drained another three. That cut the lead to 4, and the US just took over from there.