With Copa del Rey's new single-elimination format, we finally saw it claim its biggest victims on Thursday, with Real Madrid and Barcelona both being eliminated in the quarterfinals.
While Madrid were defeated 4-3 by Real Sociedad at home, Barcelona conceded a late goal to lose 1-0 at Athletic Bilbao.
Defending champion Valencia also were eliminated on Tuesday and Villarreal was knocked out on Wednesday.
Only the semifinals are being played over two legs this season, which gave smaller teams greater chances of knocking out bigger clubs.
The surprising last four will also include Granada and second-division club Mirandés.
This will be the first time in a decade that neither Madrid nor Barcelona made it to the last four in the Copa.
Barca are yet to impress under new coach, Quique Setién, and players and club directors have been at odds recently.
The Catalan giants dominated throughout the second half and came close to breaking the deadlock with clear chances for Antoine Griezmann and Lionel Messi.
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But it was Athletic who scored a late goal when Williams flicked a header into the far corner after a cross by Ibai Gómez.
This article was most recently revised and updated 3 years ago