The Mavericks defeated the Thunder 106-89 in the first preseason match.

No. 1 pick Flag made his preseason debut. He only played in the first half, playing 3 of 6 shots, 2 of 3 three-pointers, 2 of 2 free throws, and scored 10 points, 6 rebounds, 3 assists and 1 block, with plus or negative value +8. In the second quarter, he scored 10 points in a row to perform a solo show.