Cooper Flagg made his professional debut Thursday night in the NBA Summer League and celebrated an 87-85 win over Bronny James and the Los Angeles Lakers.

There were several notable faces sitting courtside to take in the Mavericks’ summer league opener. Mavs Governor Patrick Dumont sat across from the Dallas bench. He was joined by a bevy of key members from the varsity group, including Kyrie Irving, P.J. Washington, Max Christie, Naji Marshall, Jaden Hardy and Olivier-Maxence Prosper.

Dallas Mavericks head coach and former 19-year NBA veteran Jason Kidd praised 18-year-old Cooper Flagg's "incredible" poise in his 2025 NBA Summer League debut.