Frenzy became bedlam on the next play. Flagg talked trash to James, ran to his spot on the left wing, pivoted off the catch and nailed the shot before turning to exult with his future Mavericks varsity teammates, who cheered him on decked out in casual wear from their courtside seats.

The No. 1 pick in last month’s draft scores 10 points in 32 minutes and blocks a shot that leads to the game-winning 3-pointer as Dallas edges the Lakers, 87-85. Cole Swider has 22 points and 10

Cooper Flagg scored 10 points and led the Dallas Mavericks to a victory in his first NBA Summer League action.