Dexia Mons-Hainaut claimed a resounding victory over Cedevita Zagreb on the last night of Group D action in the EuroChallenge.
Arik Shivek's team won 85-64 but finished third behind Proteas EKA AEL.
Both teams had 3-3 records, but Proteas' big win last week over the Belgians gave them a superior goal differential in the meetings between the two and thus earned them a trip to the Last 16.
Dexia at least gave their fans reason to believe that the Belgian title is a strong possibility because they blew away Cedevita, who would have advanced with a victory.
On top 21-16 at the end of the opening quarter, Dexia all but put the result beyond doubt by outscoring the visitors from Croatia 25-10 in the second period to lead 46-26 at half-time.
Brandon Costner had 17 points and Ben Ebong 13 with 10 rebounds for Dexia.
The defeat will be a tough pill to swallow for Cedevita because they would have won a potential tie-breaker with Proteas, the team that finished second with a 3-3 record.
Proteas lost their game at Elan Chalon, 81-74.