In the regular season opener, the Mavericks 92-125 the Spurs at home.

After the game, PJ Washington accepted an interview with reporters. Talking about Flagg's debut, he said: "This is just a game, he will become very good in the league."

Flagg played 31 minutes and 32 seconds in this game, making 4 of 13 shots, 0 of 1 three-pointers, 2 of 2 free throws and a double-double of 10 points and 10 rebounds. He served as a point guard but had no assists and made 3 turnovers.