Traditionally, the marquee game on the opening night of summer league features the No. 1 and No. 2 overall picks from the draft playing against each other, but not this year. The NBA scheduled a matchup with Flagg squaring off against the son of the league's all-time leading scorer, LeBron James.

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

There were several notable faces sitting courtside to take in the Mavericks’ summer league opener. Mavs Governor Patrick Dumont sat across from the Dallas bench. He was joined by a bevy of key members from the varsity group, including Kyrie Irving, P.J. Washington, Max Christie, Naji Marshall, Jaden Hardy and Olivier-Maxence Prosper.