Fans have a tradition of flying the Cooper Flag during the national anthem

The Dallas Mavericks have found their new spark, and not only on the field. Rookie sensation Cooper Flagg ignited something special in Dallas, and fans are finding their own way to celebrate the arrival of the first overall pick.

Before tip-off at American Airlines Center, a new tradition had quietly, and now unmistakably, taken hold. During the national anthem, when the line “And the flag was still there” echoes through the arena, Mavericks fans erupt in unison with one single word: “FLAG!”

What started as a handful of enthusiastic fans at the opening has now turned into a full-on pre-match ritual. A roar from the crowd fills the arena, creating an electric moment that connects the team, the city and their new franchise cornerstone.

For the 19-year-old rookie, it became a surreal experience. “It’s crazy, man,” Flagg said after Dallas’ 139-129 win over the Toronto Raptors on Sunday night. “The first time I heard it, I didn’t even realize what was going on until my teammates started laughing. It gives me goosebumps every time.”

Flagg quickly established himself as a central part of the Mavericks’ future, and possibly their present as well. Starting at point guard in Kyrie Irving’s absence, the former Duke star delivered his best performance yet, finished with 22 points, four rebounds, four assists and a block on 8-of-14 shooting.

COOPER WESTLEY FLAGG pic.tvitter.com/pivnfzMiKc

— Dallas Mavericks (@dallasmavs) October 27, 2025

Flagg’s explosive and a dunk Late in the third quarter, the Dallas crowd went wild, a moment that perfectly symbolized the energy he brought to this team.

But even with his dazzling play, the national anthem moment is quickly becoming one of the most beloved traditions in Dallas sports. Fans are calling it the “loudest word in Texas,” while social media is flooded with videos capturing the chills and goosebumps that come with that powerful “FLAGG” roar.

As the season progresses, it’s clear that Cooper Flagg’s arrival means more than stats and highlights; it’s a cultural moment. Dallas finally has a new name to rally behind, and every night starts the same way.