Zaragoza is the "black beast" or "Angstgegner" of the azulgrana, having knocked them out at this stage in the previous two seasons and losing finalists last year.
Betis won the cup two seasons ago and are now lining up to eliminate their city rivals Sevilla, who are riding high in the league, as opposed to the Béticos, who can now have one over them and renew one of the fiercest football rivalries in the world.
the games:
Getafe - Osasuna (20:00h local time)
Deportivo - Valladolid (20:00h)
Barcelona - Zaragoza (22:00h)
Sevilla - Betis (21:00h Thursday)