Nico Harrison is out as general manager of the Dallas Mavericks after four years running basketball operations, the team announced Tuesday. No successor named. The timing lands Harrison's exit 47 days before the June draft, 74 days before free agency, and midway through internal modeling for Luka Dončić's supermax extension, which becomes eligible in July 2025 and will pay north of $350 million over five years.

Harrison joined Dallas in June 2021 from Nike, where he spent 19 years in basketball marketing. He inherited a roster built around Dončić and Kristaps Porziņģis, traded Porziņģis to Washington five months later, and acquired Kyrie Irving from Brooklyn in February 2023 for Spencer Dinwiddie, Dorian Finney-Smith, a 2029 first-round pick, and two second-rounders. The Mavericks reached the Western Conference Finals in 2024, losing to Golden State in five games. They're currently 38-30, fifth in the West, 2.5 games behind the fourth seed with 14 games remaining.

The departure matters because Harrison controlled Dallas's supermax timeline. Dončić is eligible for a five-year, $346 million extension this summer, but the Mavericks have delayed formal talks to preserve cap flexibility and assess Irving's fit. Irving signed a three-year, $120 million deal last July with a player option for 2025-26. If Dallas offers Luka the max this summer and he accepts, the franchise is locked into a $110 million annual payroll floor through 2030, with Irving's option and rookie-scale deals the only variables. Harrison was the architect of that calculus. His replacement inherits the decision, the cap sheet, and Dončić's agent, Bill Duffy, who has made it clear his client expects max-level commitment before the 2025-26 season.

The front office now runs through Michael Finley, Dallas's vice president of basketball operations, and executive consultant Dirk Nowitzki, who sits in on personnel meetings but holds no formal title. Finley played 10 seasons in Dallas, retired in 2010, and returned to the front office in 2016. He has never held the GM title. Nowitzki's role is ceremonial unless owner Mark Cuban decides otherwise. Cuban sold a 27% stake in the Mavericks to Miriam Adelson and her family in December 2023 for $3.5 billion, valuing the franchise at $13 billion. The Adelsons now control basketball operations decisions, though Cuban remains governor. The timing suggests Adelson-side discomfort with Harrison's cap strategy or his read on Dončić's extension window.

Three things to watch. First, whether Dallas promotes internally or hires externally before the draft. The franchise has two first-round picks in 2025, their own and a top-10 protected selection from the Porziņģis trade that converts to two seconds if it doesn't convey by 2027. Second, whether Finley or a new GM accelerates Dončić extension talks before free agency opens July 1. The risk is twofold: Dončić could wait, Irving could opt out, and Dallas enters 2025-26 with $68 million in committed salary and no long-term clarity. Third, whether Harrison lands at another franchise before summer. He's 48, still has Nike relationships across the league, and was the primary architect of Dallas's pivot from Porziņģis to Irving, a deal that looked optimistic in real time and remains unresolved on the court.

Harrison's phone has been off since the announcement. Finley's has been ringing.