It’s hard to draw any conclusions from the preseason, and it’s even harder against an overmatched Brazilian team.

But the Nets opened their preseason with high expectations on Friday and they did what they were supposed to. They rolled Sesi Franca Basquete 137-89 at Barclays Center, and the rout was as bad as it sounds.

After the Nets all came back from their weeks of offseason workouts in Los Angeles gushing over Taurean Prince, the forward went out and backed up all the praise with a team-high 22 points.

He led the way for a team that led by as many as 38 points in the fourth quarter. The Nets handed out 40 assists and shot a scalding 60 percent, holding their foes to just 39.3.

“I liked our quick decisions. It’s part of our principles. Shoot it, move it, drive it, and the guys did a really good job across the board,” coach Kenny Atkinson said. “But we have to follow it up again. Forty assists is a big number. I’m very pleased with that.”

Following that up in China next week in two games against the Lakers will be far tougher. They play LeBron James, Anthony Davis and company on Oct. 10 in Shanghai and again two days later in Shenzen. But for Friday’s preseason opener, all the Nets could do was beat the team in front of them, and they beat them like a drum.

David Nwaba and Dzanan Musa each had 18 points, while Caris LeVert and Nic Claxton added 13 apiece. But Prince — expected to contend for the starting power-forward spot with Kevin Durant rehabbing his torn Achilles tendon after surgery — was arguably the highlight.

“It’s just proof that the work I’ve put in and that the coaches have put in and the things we’ve been doing as a team have been working. I’m glad we’ve been able to transfer it over to the game,” said Prince, who was acquired by the Nets in a cap-clearing deal with the Hawks.

“I just looked at it as an opportunity to play ball. A lot of people that get traded don’t get the opportunity or end up in a bad situation, so it’s just a blessing I was able to play in Brooklyn.”

Prince shot 8-of-10 and hit 6-of-8 from 3-point range.

“He’s got an edge and we really want him to bring that to the defensive end. … We need him to defend and I thought he was good,” Atkinson said. “He’s following up on what we see in practices and offseason work.

“Not only his shooting, but I was impressed with how quickly he moves on offense. His release is really quick and he can get it off in small spaces. He made some nice passes, too … so just a very good all-around game from him.”

Prince started at small forward, with Rodions Kurucs at power forward. The Nets have until Oct. 21 to sign Prince to a rookie contract extension, or they face the prospect of letting him hit restricted free agency.

The Nets coughed up 17 quick points to Franca’s 6-foot-8, 275-pound center, Rafael Hettscheimeir, who went 5-for-5 from deep early to keep the Brazilians close at 24-23.

Atkinson refused to adjust his scheme, daring his players to figure it out on the fly. And they held Hettscheimeir to just nine points the rest of the way.

Still leading just 32-29 early in the second quarter, the Nets ran off nine unanswered points to make it 39-29.

Musa’s cutting layup pushed it to 41-29 with 8:26 left in the second quarter. The Nets spent the rest of the half blowing the game wide open and the lead reached 74-53 by the break.

DeAndre Jordan’s cutting dunk pushed it to 102-74 with 10:05 left to play. The rest of the game was garbage time.