The Mavericks put a lot of trust in Flagg to handle the ball on Thursday (more on that later), and he looked like an obvious mismatch when lined up as a "guard."

Cooper Flagg goes 5-of-21 from the field and puts up 10 points, 6 rebounds and 4 assists in his summer league debut for the Mavericks.

"His poise as an 18-year-old is incredible," Kidd said.