Alfred Finnbogason struck twice to fire David Moyes' Real Sociedad past Copa del Rey opponents Real Oviedo last night.
La Real went into the game with the aggregate score locked at 0-0 from the first-leg, but Finnbogason's brace settled the tie.
The goals from the Icelander is significant for Moyes, with the striker's form seen as key to the club's chances of climbing up the table.
Moyes said: "It's very important to stay in the cup, but the league is the competition that we are really focused on.
"I'd love to win the cup and we'll do everything we can to do so, our focus remains on the league campaign."