Grading Cooper Flagg’s 2025 NBA Preseason Debut with Dallas Mavericks

Cooper Flagg made his first appearance in a (non-summer league) NBA jersey on Monday, when his Dallas Mavericks annihilated the shorthanded Oklahoma City Thunder, 106-89.

Individually, Flagg may have been a little deferential to start, but by the end of his 14 minutes of action, he’d shown just about everything that made him the No. 1 pick in June and put up 10 points, six rebounds, three assists and a block.

Now that his impressive debut is in the rearview, it’s time to bust out the rubric and give him some traditional letter grades.