Dallas Mavericks rookie Cooper Flagg felt firsthand how helping to initiate an NBA offense can be a physically demanding task.

After just two games, the Mavericks have shut down No. 1 pick Cooper Flagg for the rest of Summer League. Following a 31-point breakout performance and a crash course as a point-forward, Flagg impressed early,

There were a few moments when the two players squared off and a series of physical possessions were highlighted.