Dallas Mavericks rookie Cooper Flagg felt firsthand how helping to initiate an NBA offense can be a physically demanding task.

Thursday night’s matchup between Cooper Flagg and the Dallas Mavericks and Bronny James and the Los Angeles Lakers was the fourth-most-watched Summer League game ever, per ESPN.

Flagg led all scorers with 31 points in 31 minutes, adding four rebounds while shooting 10-for-21 from the field and 3-for-9 from beyond the arc.