Jayson Tatum was there. So were Anthony Davis, Steph Curry and the rest of the US Olympic basketball team.

Including LeBron James, for crying out loud.

And yet, even with all that future Hall of Fame talent on the floor in Las Vegas, the 1 player everyone came away talking about Monday was a teenager still 5 months from playing his first college game.

The Cooper Flagg hype is real.

And if his performance against all those NBA stars in a scrimmage designed to help them prepare for the upcoming Paris Games is any indication, it’s only going to grow stronger between now and the time the 17-year-old prodigy makes his debut in a Duke uniform in November.

Mark those calendars. The legend is set to begin on Nov. 4 at Cameron Indoor Stadium. Coincidentally, or maybe not so coincidentally, against a team from his home state, the University of Maine.

Zion 2.0?

Probably not that crazy. But it’s possible. Especially now.

Flagg is the top-ranked recruit coming into the college game this season. He’s a 5-star prospect with the size and length at 6-9 to score at the rim, the feathery shooting touch to knock down 3s and the chutzpah to stand out in a crowd.

Even a crowd of the best basketball players in the world.

He was already projected as the No. 1 overall pick in next year’s NBA Draft before the past few days in Vegas. Now after showing out as the only non-professional at the pre-Olympic training camp, there’s talk of teams tanking to give themselves a shot at getting him.

“He’s a special young man,” Orlando Magic coach Jamahl Mosley, who coached Flagg and the so-called Select Team, told Sean Powell of NBA.com after Monday’s scrimmage. “His talent level, his basketball IQ, his level of toughness. (He’s) not afraid of those moments, protect the rim, make the right play, make the right read. He had all that.”

Moseley’s rave review is hardly a revelation. It’s similar to virtually every other scouting report since Flagg began high school.

The difference is that this one didn’t come after the EYBL Peach Jam, McDonald’s All-American Game or some other competition involving players his own age. It appeared to be a matchup of the men against a boy.

If that was, in fact, the case, then the boy has officially become a man.

No stats from Monday’s scrimmage were released. And the media were only allowed into the gym at UNLV for a short time at the end.

Still, enough video has surfaced on social media to provide at least a glimpse into why King James himself made it a point to give Flagg a respectful pat on the back and hug once the game ended.

The highlight was a sequence in which the future Blue Devil pulled up for a 3-pointer over AD’s outstretched hand, hustled back on defense to grab a rebound, started a fast break with a crisp outlet pass, then finished with a tip-in over Bam Adebayo as he was fouled.

There was initially some pushback when Flagg was named to the Select Team along with NBA rising stars Brandon Miller of the Charlotte Hornets, Trayce Jackson-Davis of the Golden State Warriors and Jaime Jaquez of the Miami Heat.

It was viewed in a similar light to that of Christian Laettner’s addition to the original Dream Team for the Barcelona Olympics in 1992. Gratuitous at best. A favor to Olympic assistant and future head coach Mike Krzyzewski.

Comparisons between Flagg and Laettner are inevitable. And there are some similarities.

Both are talented stretch 4s with the ability to run the floor and score inside and out. Both also fit into the “Duke player everyone loves to hate” mold.

Laettner, however, was one of the most decorated college players ever. He’s a Hall of Famer who played in 4 Final Fours and won 2 national championships.

Flagg’s story is yet to be written.

But it’s off to a good start.

“It was just an honor to come out here and compete,” he said in a postgame interview with Washington Post NBA writer Ben Golliver. “Every one of (the NBA players) reached out to me. They’ve all been very welcoming. (They) told me to keep working and stay confident.”

It took Laettner getting popped in the kisser by a Patrick Ewing elbow to earn the respect of the NBA veterans surrounding him in ’92. Flagg was able to accomplish the same result in a much less painful and much more impressive manner.

The kid didn’t just show off his ability. At a high level. He also displayed a humility that will serve him well as he advances through his basketball career.

Especially now that the hype machine is about to start cranking into high gear.