Don Nelson, a transformative figure in professional basketball, has died at 86. Nelson’s career was defined by his tactical innovation, most notably the implementation of 'Nellie ball,' a style of play that emphasized versatility, small-ball lineups, and unconventional positional roles. This strategic approach influenced the modern era of the NBA, where floor spacing and positionless basketball have become standard.

Nelson’s professional journey began as a player, but he is perhaps best remembered for his tenure on the sidelines. In 2012, he was inducted into the Naismith Memorial Basketball Hall of Fame. At the time of his induction, he held the record for the most regular-season victories by a head coach in league history. While he has since been surpassed in the win column, he remains the second-winningest coach in the history of the NBA. His contributions extended beyond the stat sheet, as he was widely regarded as a pioneer who challenged traditional coaching philosophies and pushed the boundaries of how the game could be played.