The Dallas Mavericks have officially unveiled their roster for the upcoming NBA Summer League in Las Vegas—and the name at the top of the list is turning heads across the basketball world. Cooper Flagg, the projected No. 1 pick in the 2025 NBA Draft and one of the most electrifying young talents in years, will be suiting up for the Mavericks in what promises to be one of the most anticipated Summer League appearances in recent memory.
This announcement, confirmed through the Mavericks’ official social media channels, sent fans and analysts into a frenzy. While Flagg is not draft-eligible until next year, his inclusion on the Summer League roster is part of a special developmental initiative—an increasingly popular trend that allows elite prospects to train and compete with NBA-caliber talent in a controlled environment. For Flagg, it’s a golden opportunity to get a head start on the NBA learning curve. For the Mavericks, it’s a statement: they’re investing in the future as much as the present
If you haven’t heard of Cooper Flagg yet, you’re about to.
The 6-foot-9 forward from Newport, Maine, reclassified to the class of 2024 and committed to Duke University for one collegiate season before he makes his expected leap to the NBA. Widely considered a generational prospect, Flagg has drawn comparisons to a young Kevin Durant due to his fluid shooting, elite defensive instincts, positional versatility, and competitive fire.
At Montverde Academy in Florida, Flagg dominated the high school circuit, showcasing a rare blend of athleticism, basketball IQ, and leadership. He was the unanimous No. 1 ranked player in his class, starred in elite prep tournaments, and was a standout at Team USA junior camps.
More recently, Flagg made headlines when Dallas Mavericks legend Dirk Nowitzki reportedly defeated him in a casual one-on-one matchup after a team practice—a moment Flagg later described as “humbling” and “inspirational.” Now, just weeks after that encounter, Flagg will take the floor wearing Mavericks colors, facing off against rising NBA hopefuls under the bright lights of Las Vegas
Flagg’s participation in the Summer League is about far more than highlights or viral dunks. It’s a calculated move to give him early exposure to NBA pace, spacing, and physicality. According to sources within the Mavericks’ player development team, Flagg will participate in team practices, film sessions, and game action during the Las Vegas showcase. While his minutes may be managed, his presence is already having an impact.
“This is about learning,” one Mavericks official said. “It’s about putting him in an environment where he’s surrounded by professionals—guys fighting for roster spots, coaches installing advanced systems, and teammates who’ve already experienced what it takes to make it at this level. That’s invaluable for someone like Cooper.”
The Mavericks’ Summer League squad features a mix of recent draft picks, undrafted free agents, and G-League standouts. Names like Olivier-Maxence Prosper, A.J. Lawson, and rookie forward Baylor Scheierman round out a competitive group. For Flagg, it’s a perfect storm: intense competition without the pressure of regular-season scrutiny.
Head coach Jared Dudley, who will lead the Mavs’ Summer League team, is enthusiastic about Flagg’s presence.
“Cooper is a sponge,” Dudley said. “He listens, he asks questions, and he competes. He’s not here to showboat—he’s here to grow. And that’s exactly what you want from a kid with his ceiling.”
Flagg’s Summer League debut will be one of the most-watched moments of the event, likely drawing national media coverage and packed arenas. But what should fans expect?
- Defensive Versatility
Flagg has already earned a reputation as an elite shot-blocker and on-ball defender. Expect to see him guarding multiple positions—switching onto guards, contesting shots at the rim, and communicating on defense like a veteran. His timing and awareness on that end of the court are advanced beyond his years. - Offensive Initiation
While Flagg is known for his scoring, how he operates in an NBA-style offense will be closely analyzed. Can he run pick-and-roll? Can he shoot off the dribble against pro-level defense? Can he handle ball pressure? Summer League is where those questions begin to get answered. - Physicality and Conditioning
The NBA game is more physical than high school or even elite prep ball. Flagg will be tested by older, stronger players trying to prove themselves. How he absorbs contact, fights through screens, and sustains his energy over multiple possessions will be key development benchmarks. - Leadership and Composure
Perhaps most importantly, scouts and executives will be watching how Flagg carries himself. Does he lead huddles? Does he bounce back from mistakes? Does he respond to coaching? These intangible traits often separate good prospects from great ones
Flagg’s appearance on the Mavericks’ Summer League team is no accident. While he is not draft-eligible until 2025, his relationship with the Mavericks has deepened over the past year, due in part to mentorship from Dirk Nowitzki and regular training sessions with Dallas player development coaches.
There are whispers that Flagg could be eyeing Dallas as a preferred destination next summer—assuming he declares for the draft and the Mavericks have the assets or draft capital to acquire a top pick. Though that remains speculative, his current involvement with the team signals mutual interest.
More immediately, the Mavericks are positioning themselves as a franchise committed to youth development and long-term growth. Under the leadership of Nico Harrison and head coach Jason Kidd, Dallas has invested heavily in its infrastructure—from analytics and performance science to mental health support and nutrition. For a rising star like Flagg, it’s the kind of environment where future greatness can be cultivated
The announcement of Flagg’s Summer League inclusion sparked a wave of excitement across the basketball landscape. Social media lit up with reactions from players, analysts, and fans alike.
“Cooper Flagg in Summer League? Inject that into my veins,” tweeted one NBA reporter.
“Dallas is playing chess,” wrote another. “Flagg’s not draft-eligible yet, but they’re building the relationship early.”
Even LeBron James, who had previously praised Flagg’s high school highlights, reposted the news on Instagram with a fire emoji and the caption, “This kid is DIFFERENT.
While the NBA Summer League is typically a proving ground for fringe roster players and raw rookies, this year’s event has something rare: a preview of tomorrow’s potential superstar. Cooper Flagg isn’t just another prospect—he’s a 17-year-old phenom entering the orbit of professional basketball with the skill, poise, and charisma to become one of the faces of the league.
The Mavericks’ decision to include him in their Summer League roster is bold, forward-thinking, and potentially franchise-defining. It offers Flagg a head start, gives Dallas a recruiting edge, and delivers fans the tantalizing opportunity to see greatness in its early stages.
And make no mistake—the games in Las Vegas may be labeled “exhibition,” but they’ll carry very real implications. Every dribble, every block, every three-pointer Flagg attempts will be dissected, debated, and remembered.
He’s not in the NBA yet. But this is his first step into its spotlight.
The Cooper Flagg era starts now. And the whole basketball world is watching