Cooper Flagg's summer league debut wasn't perfect. But there were flashes of greatness, and at this stage the Mavericks would be wise to let him fail.

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.

Though the No. 1 pick struggled to make shots, Cooper Flagg had flashes of brilliance during his debut with the Mavericks on Thursday.