 Mavs general manager Nico Harrison on Nijinka's game. Athletic, can shoot 3 and D. He's young. He just turned 20 yesterday. So, you know, really young, huge upside. We just like the way he plays. I mean, he has a chance to be really good. The Mavs get set for the NBA Summer League, which begins Monday, July 8th. Jake Reitman, TSN Sports.