The Boston Celtics have clinched their record-breaking 18th NBA Championship by defeating the Dallas Mavericks 4-1 in the finals. As the Mavericks focus on re-signing key free agents like Derrick Jones Jr. and veteran Morris, they also face significant offseason decisions to bolster their roster for another playoff run. The NBA's new salary cap increase to $141 million provides teams with more flexibility for player contracts. The Orlando Magic's offseason priorities include key decisions on retaining guards Markelle Fultz and Gary Harris. Meanwhile, the Oklahoma City Thunder show interest in acquiring Isaiah Hartenstein, despite financial constraints. All teams are gearing up for the NBA Draft and free agency, which will be critical in shaping their futures.