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A Luis Suarez header gave Atletico Madrid a 1-0 home win over Getafe in coach Diego Simeone's 500th game in charge.
Spanish media reported on Friday that police are investigating possible match-fixing in a 2-2 draw between the two clubs in La Liga last year.
Barcelona fell to their first defeat in La Liga under new coach Ronald Koeman as they lost 1-0 at Getafe, hours after champions Real Madrid slipped to a 1-0 defeat at home to promoted Cadiz.
United booked a quarterfinal spot after their second-string side laboured to a 2-1 home win over LASK Linz to seal a 7-1 aggregate rout of the Austrian side.
Results 1-4