Casino Xialian, the Mavericks narrowly defeated the Lakers 87-85. No. 1 pick Flag made his debut in the summer league, and he was interviewed after the game.

Regarding his performance in the first summer league, Flag commented: "It has not met my standards, but I will adjust it."

Flag played for 31 minutes, made 5 of 21 shots, 0 of 5 three-pointers, 0 of 1 free throw, scored 10 points, 6 rebounds, 4 assists and 3 steals, with a plus-minus value of -1.