On the first day of his first Mavericks training camp, Jan. 21, 1999, Dirk Nowitzki arrived in a Plymouth he had rented for that NBA lockout-shortened season.On Saturday, the first day of his first Mavericks camp, Luka Doncic was awaiting delivery of his new Mercedes-AMG C 63 S. Dark blue, if you're wondering.What a remarkable trail Nowitzki has blazed, initially in that heap of metal, for a generation of European NBA players that now includes 19-year-old Slovenian teammate Doncic."For me it's great just to share a locker room with him this year," Doncic said.