By Daniel Bates Luka Doncic and future Hall of Famer Dirk Nowitzki have one of the most wholesome relationships in basketball. Although Luka and Dirk only got to play together for one season before Nowitzki retired, the German-born legend has served as a mentor to his fellow European phenom and the two remain close to this day. After traveling to Sweden to watch Luka participate in the FIBA World Cup Qualifier for Slovenia, Doncic surprised Nowitzki and his family in the pregame tunnel where he joked around and shared an embrace with the Mavs legend. NBA Twitter reacted to the exchange on Sund…