LAS VEGAS — The first 30-point game in the 2019 Las Vegas Summer League was still fresh Sunday night when the man responsible for it took a winding walk through the bowels of the Thomas & Mack Center.

The 20-year-old Knicks rookie had put on a show, complete with his trademark flair, to introduce himself to the NBA in just his second pro game. It added some extra responsibilities to his postgame schedule. After meeting with the media, he was escorted away to a trailer on the other side of the arena to get his face scanned so his likeness on a video game would be more realistic. Such is life when you drop 30 points in the summer league.

Some may have been surprised by the breakout performance of the No. 47 pick in June’s draft, but not those around him, and certainly not the man himself.

“Absolutely not,” Ignas Brazdeikis said. “I would have been surprised if I did worse.”

This is the mentality the well-traveled Brazdeikis is bringing with him to New York: supremely confident, trained by his father to fight physically and mentally, and always chasing bigger dreams. The 6-foot-7 wing’s home has changed over the years — from Lithuania to Chicago to three different cities in Canada — but his vision of how this is all supposed to all play out has not.

The source of that confidence, according to those closest to him, is his close-knit family. Especially his dad.

“It’s like a puzzle,” Sigis Brazdeikis, Ignas’ father, said as he tried to trace the origin. “There’s a lot of pieces to that.”

Like many 6-year-olds, Brazdeikis planned on playing in the NBA when he grew up. Unlike most 6-year-olds, Brazdeikis actually will.

The dream began in Etobicoke, Ontario, in 2005, after the Brazdeikis family moved there from Winnipeg. It was the fourth stop on his journey to New York, but the first that had a full outdoor basketball court just outside his apartment.

“I’d spend so much time there during the day,” Brazdeikis said. “Then during the evening there’d be runs, scrimmages. I’d play with the older guys and I just kind of fell in love with the game.”

While nobody else in Brazdeikis’ family played basketball, he took to it quickly. Sigis, a mixed martial arts fighter himself back in Lithuania, had introduced him to boxing gloves around that same time. But the father was happy seeing his son explore another sport.

“I could see he was passionate,” Sigis said. “He loved that. He could go out by himself and play just hours and hours.”

That didn’t stop their training sessions, fit for a fighter but good enough for a rising basketball player. They went to boxing gyms and shared intense workouts. They were tough. They also began to build Brazdeikis’ strength, conditioning and character.

“I watched him when I was a kid,” Brazdeikis said. “It inspired me so much. He taught me what he knew. He taught me to be able to defend myself and be confident with myself everywhere I go.”

By 2008, the family made another move and put roots in Oakville, Ontario, a suburb outside of Toronto, where they still live today.

Brazdeikis’ basketball talent continued to grow as he played more and joined structured leagues. The lefty could always shoot. The rest of his game was not far behind.

In 2015, he represented Canada for the first time in the FIBA U16 Americas Championship and took home a silver medal. He had a teammate named Rowan Barrett Jr., better known as RJ. It wouldn’t be the last time they shared the court.

That fall, Brazdeikis enrolled at Orangeville Prep as a sophomore and didn’t take long to make his mark. In a Jordan Brand Invitational game against powerhouse Oak Hill — Kevin Durant’s alma mater, with another alum, Carmelo Anthony, sitting courtside — Brazdeikis dropped 31 points.

“He never shies away,” former Orangeville Prep assistant coach Younis Hussein said. “When the lights get bigger, the opportunity’s there, he’s going to take it.”

The breakout game did little to satisfy Brazdeikis’ hunger, though. The early-morning workouts continued because he still wasn’t where he wanted to be. He’d get to the gym as early as 6:30 a.m. to put up shots or lift weights before school, often coming back at night for more.

In the gym, Brazdeikis would see banners on the wall and pictures of alumni like Jamal Murray and Thon Maker. He wondered why he couldn’t be like them and be up there one day, too. His final two seasons made sure he would.

As a junior, Brazdeikis averaged 30 points and 10 rebounds per game, including back-to-back 50-point outings. He backed that up with 28.4 points and 8.4 rebounds per game his senior year, including a win over Cam Reddish’s Westtown in which Brazdeikis outplayed the Duke recruit, according to former Orangville Prep coach Nate Johnson.

“I can’t ever bet against him, because I’ve seen so many people do it and he makes them look silly,” Johnson said. “That’s kind of what fuels him and gives him that bravado. So many people doubted him and told him he couldn’t do it. He just has the mentality of, ‘Watch me.’ ”

Brazdeikis’ next feat was becoming John Beilein’s first one-and-done player at Michigan. He turned in a strong season as the Big Ten’s Freshman of the Year, leading the Wolverines with 14.8 points per game while shooting 39.2 percent from 3. He opened more eyes to his talent along the way, including those of his girlfriend.

Jasmina Gusic had not seen Brazdeikis play until he got to Ann Arbor and didn’t know about his basketball exploits. They had started dating at home in Oakville, where they met at a bar. They were just friends at first, but Brazdeikis put his confidence and determination to use again to convince Gusic to date him.

“It was just consistency,” Gusic said. “He didn’t give up.”

As for that first time she saw him play in maize and blue?

“He just blew my mind,” Gusic said. “I was like, ‘Wow, this kid actually has talent.’ ”

Brazdeikis does that to a lot of people who are watching him play for the first time. He may not look the part when he steps on the court, but by the time he leaves it, you know it.

“He actually loves when people underestimate him because then he’s like, ‘The shock will be that much bigger when you see what I can do,’ ” Hussein said.

“Coming from Canada, playing the style he plays, if you’re not extremely confident in your skills as a 6-8 white guy from Oakville, Ontario, no one’s going to take you seriously,” Johnson added. “He just has that swag to him where he knows he can get it done by any means necessary.”

Brazdeikis did it again Sunday night in Las Vegas. He made the most of his first start, showing off his ability to get to the rim and finish while also scoring from downtown. He followed some buckets by flexing his biceps, others by rubbing his fingers together for a money sign. He kept it simple, putting up three fingers on each hand, when he drained a 3 with 24 seconds left in regulation to tie the game and send it to overtime.

Back in the hallways of the Thomas & Mack Center, Knicks summer league coach Jud Buechler described Brazdeikis as “a fighter … a scrapper.” That’s just the way he was trained.

Of course, waiting for him on his phone after the game were a few texts from his dad, who was watching from back home in Oakville: “Loved it. Just enjoying your game. Beautiful to watch.”

Not that Sigis was surprised. His son had put in the work for nights like these.

“Whatever your dream is … you lose it if you do not put the hard work into it,” Sigis said. “Put in everything that you can and then there’s no regrets.”

It’s all part of the puzzle.

A big piece is his family — Sigis, his mom Diana, sister Emma and brother Augustas. They moved around a lot, but always had each other for support.

“His parents held him accountable, they knew what he was capable of, they believed in him and they loved him,” Johnson said. “I think that created the monster that is Iggy right now.”

Every time Brazdeikis steps on the court, he believes he is the best player out there. Making that happen in the NBA has always been the dream, and Brazdeikis believes he has only just begun.

“I thought I’d be here ever since I was 6 years old, if I’m being completely honest with you,” Brazdeikis said. “That’s just in my nature. I feel like if you believe in yourself and you visualize this stuff every single day, it’s going to happen. There’s no doubt. You put in the work, it’s only a matter of time.”