NBA Western Conference NBA Cup, the Mavericks reversed the Pelicans 118-115.

Flagg, the top pick of the Mavericks, performed very well in this campaign. He passed and shot at the critical moment in the final quarter, scoring 5 points and 1 assist to lead the team's lead. In 32 minutes of play, he made 12 of 19 shots, 0 of 4 three-pointers, and 5 of 6 free throws. He scored 29 points, 7 rebounds, 5 assists, and 2 steals, with a plus-minus value of +9. Flagg scored 12 points, 4 rebounds, 3 assists and 1 steal in the final quarter.

Ranking of 20+ games before 19 years old:

1. James 14 times

2. Flagg 5 times

3. Kobe 4 times