Dirk Nowitzki talks Don Nelson's passing, upcoming Mavs season

Dallas Mavericks legend Dirk Nowitzki will host his 8th annual Dirk Nowitzki Foundation Tennis Classic on September 19, and he sat down with FOX 4's Sam Gannon to talk about the tournament, the passing of his first NBA coach Don Nelson, what he thinks of the Mavs this upcoming season, and more!