Nembhard Shines, Flagg Learns: Mavericks’ Rookie Duo Shows Promise in Summer League Debut

All eyes were on Cooper Flagg as the Dallas Mavericks took the court for their NBA Summer League opener, but it was undrafted point guard Ryan Nembhard who stole the show — and the win.

In front of a sold-out Thomas & Mack Center buzzing with anticipation, the No. 1 overall pick made his highly anticipated debut. But while Flagg’s stat line told the story of a tough shooting night — 5-of-21 from the field, 0-for-5 from beyond the arc — it was his late-game defense and court vision that proved decisive in the Mavericks’ 87–85 victory over the Los Angeles Lakers.

With 1:09 remaining and the score tight, Flagg rotated perfectly to block Lakers guard DJ Steward’s layup attempt. He then led the fast break, maneuvered through a swarm of defenders, and kicked out to a wide-open Nembhard, who drilled a clutch three that gave Dallas the lead for good. That moment didn’t just seal the game — it showcased the foundation of a potential long-term backcourt partnership.

“Ryan’s been incredible,” Flagg said postgame. “His feel for the game is unreal. Super easy to play with, super unselfish. That kind of connection, we’re just getting started.”

A Rough Start for a Future Star

Flagg admitted afterward that it wasn’t his finest hour, even jokingly calling it “one of the worst games of my life.” Given his dominance at Duke and in high school, that’s not entirely hyperbole. But it’s also not the whole story.

The 18-year-old was thrust into an unfamiliar role: primary ballhandler and playmaker. Mavericks coach Jason Kidd had emphasized that Summer League would be a proving ground for Flagg’s ability to run an offense — a challenge that the Lakers immediately seized upon by pressing and trapping him early and often. Former NBA swingman Darius Bazley, long and crafty, gave Flagg particular trouble.

Still, despite shooting woes, Flagg only turned the ball over once, showed poise under pressure, and came up big when it mattered most. His first basket — a coast-to-coast dunk off a steal — offered a glimpse of the athleticism that made him a generational prospect. Later, he shook off Bronny James in the post for a smooth turnaround jumper, igniting the crowd.

“That’s what I wanted to see,” said Mavs assistant coach Josh Broghamer. “Even when the shot isn’t falling, can you impact the game in other ways? He did that. Defense, passing, leadership — that’s Cooper.”

Nembhard’s Moment

Meanwhile, Nembhard played like someone with nothing to lose — and everything to gain. The 6-foot point guard from Aurora, Ontario, turned heads with a composed, confident performance. He hit tough shots in isolation, organized the Mavericks’ offense, and played aggressive on-ball defense.

A two-way contract signee, Nembhard declined to be selected in the back half of the second round of the draft in hopes of landing with the right team. That bet is already paying off.

“He’s built for this,” said Broghamer. “You usually try to hide your smallest guy late in games, but not Ryan. He boxes out guys bigger than him. He fights. He reads the floor. He makes winning plays.”

The chemistry between Flagg and Nembhard is already apparent, and the Mavericks coaching staff has taken notice. With Kyrie Irving potentially out for the season and only D’Angelo Russell penciled in as the starting point guard, Nembhard’s opportunity is very real.

“I just wanted to go where I could make an impact,” Nembhard said. “If I get a shot, I’ll figure it out.”

Lessons, Not Losses

Flagg’s maturity showed in how he reflected on the night. “Yeah, it wasn’t the prettiest,” he said. “But it’s a different game — spacing, pace, personnel. I’m just trying to adjust, take it all in. I’m grateful to be here.”

And while the spotlight was brightest on him, Flagg deflected credit to his teammates and emphasized that the win mattered most. His learning curve is steep, but his ceiling remains sky-high — and Summer League is just the beginning.

The Mavericks’ rookie duo may have entered the league on different paths, but if Thursday night was any indication, their futures could be intertwined.

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