33 teams (title holder, league champions and a variable number of runners-up in some domestic championships) playing knock-out rounds on a home and away basis. The aggregate score of both games decides the winner.
The sixteen remaining teams after the knock-out rounds enter the Regular Season Group Stage, divided into two groups of eight playing a round-robin. The final standing is based on individual wins and defeats. In case of a tie between two or more teams after this group stage, the following criteria is used to decide the final classification: 1) number of wins in one-to-one games between the teams; 2) basket average between the teams; 3) general basket average within the group.
The top four teams from each group after the Regular Season Group Stage qualify for a Quarterfinal Playoff (X-pairings, best of 3 games).
The four winners of the Quarterfinal Playoff qualify for the Final Stage (Final Four), played at a predetermined venue.