Before the start of the regular season, the Torneo Súper 20 took place, which awarded two berths to the 2019 Liga Sudamericana de Básquetbol.

[1] La Liga Argentina de Básquet Champions Libertad covered the berth left by Salta Basket, who lost the relegation playoffs against Ferro Carril Oeste.

The second edition of the pre-season tournament Torneo Súper 20 took place between 22 September and 22 december 2018.

The top three teams from each group advanced to the playoff stage directly, while the fourth and fifth teams of each group were paired in four best-of-three series to grant the four remaining berths for the playoff stage.

The playoff stage consisted of best-of-three series up to the semifinals, where a final four, single-elimination match format was used.