DALLAS (AP) — Dallas Mavericks general manager Donnie Nelson, instrumental in the club’s acquisitions of Dirk Nowitzki and Luka Doncic, is leaving the organization after 24 seasons. The Mavericks say they mutually agreed to part ways with Nelson. The son of former coach Don Nelson joined Dallas with his dad in 1998. Nowitzki came in a draft-day trade a few months later. The German led Dallas to the championship in 2011. The Mavericks haven’t won a playoff series since then. Doncic came in another draft-day deal in 2018.