TOKYO — Anyone who’s ever jacked up a fadeaway 3 in a pickup basketball game knows there are two sure ways to start a fight on the playground.

Talk trash about someone’s mom.

Or call an offensive foul.

In the debut of 3-on-3 halfcourt hoops at the Olympics on Saturday, Arvin Slagter of The Netherlands set a vicious pick on Dejan Majstorovic of Serbia that sent Majstorovic crumpling to the ground.

A whistle blew. A referee wearing a slate-gray T-shirt and black shorts balled his hand into a fist, thrust out his arm and made the call that would get fists flying in a totally different way in a real street game. “Offense!” he shouted as he called the foul.

Nobody argued. It was one of many signs that this Olympicized version of urban “streetball,” as the game’s higher-ups sometimes call it, is a bit different from whatever is going down on blacktops across America and the rest of the world.

Different, yes — but to hear these players tell it, still pretty fun.

“3-on-3 is basketball in a very intense way,” said Slagter’s teammate, Jessey Voorn. “But it is not streetball.”

The Olympics like the idea of “streetball” because they’re doing everything they can to inject the busy summer program with sports that will attract a younger, more international audience. Skateboarding, surfing, sport climbing and, three years from now in Paris, break dancing (The ‘80s called, they want their boom box back) are among the new sports also chosen to service this mission.

In at least one way, 3-on-3 is fitting the bill perfectly. The game invented and perfected in the United States does not have a U.S. team on the men’s side of the eight-team Olympic bracket. It does have a women’s team from Mongolia.

It does not have fans, at least not in Tokyo, where they are not allowed in because of the pandemic.

It does have DJs. They were in the house all day, spinning records — Daft Punk, Kanye West and more — for the empty stands that, someday, will be full again.

The games take place on a gray court situated under a cone-shaped canopy that covers the middle of an arena built to seat 7,100. Even in the shade, the heat index cracked 90 degrees on a sweltering afternoon near Tokyo Bay.

“I’ve said they call it ‘streetball’ only because of the environment,” said USA center Stefanie Dolson, a former UConn star who was the sixth pick in the 2014 WNBA Draft.

“They have music playing. There’s a commentator on the sound system saying ”Big Mama Stef!’ You’re outside and the weather can play a factor. It’s streetball in that way.”

The Olympic version is like the pickup game in this way, too: 3s from behind the arc are worth 2 points and 2s from inside are worth 1, and teams have to clear the ball past the arc after a rebound. The first team to 21 wins, but to keep things moving, if nobody hits that number in 10 minutes, whoever is ahead wins the game.