LAS VEGAS (AP) — Cooper Flagg strolled into UNLV’s Thomas and Mack Center at 4:17 p.m. on Thursday, wearing Dallas Mavericks gear, bright white New Balance shoes, and an emotionless look on his face as he passed through security.

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.

Bronny James Welcomes Cooper Flagg to NBA With Multiple Jumpers in His Face originally appeared on Athlon Sports. After being taken with the No. 1 overall pick in the 2025 NBA Draft by the Dallas Mavericks, Cooper Flagg officially made his NBA Summer League debut on Thursday at the Thomas & Mack Center.

Hill got a close look at Flagg's competitive edge last summer when USA Basketball invited the then-high school phenom to practice with the Select Team ahead of the Paris Olympics. As managing director of the program, Hill watched Flagg hold his own against NBA players -- a rare opportunity for a teenager.