Zaragoza endured the come-back of Baskonia and defeated the Basques at home (76-69), eliminating them from the ACB semi-finals (2-0).
The hosts made a great start (26-9), but the visitors turned things around and outscored their opponents 23-46 to earn the lead (49-55).
Yet, Zaragoza stepped up and went on a 27-14 run in the fourth quarter to seal the deal and advance to the semi-finals.
Nemanja Radovic posted a game-high 16 points for the winners, while Javier Justiz added 14 points.
Jaysin Granger was the best player of the losing squad, with 12 points. Tornike Shengelia scored 12 points for the Basques.
Zaragoza will face either Barcelona or Badalona in the semi-finals.