MADRID (AFP) - Pablo Hernandez scored twice either side of former Manchester City and Celtic striker John Guidetti's sensational strike as Celta Vigo dumped Atletico Madrid out the Copa del Rey 3-2 on Wednesday.
Following a 0-0 draw in the first-leg last week, Hernandez handed Celta the vital away goal when he headed home the opener midway through the first-half.
Antoine Griezmann gave the 10-time Cup winners hope with an equaliser before half-time.
But Guidetti's stunning hit into the top corner from 25 yards and another Hernandez header sealed the Galicians a place in the semi-finals before Angel Correa's late consolation.
Holders Barcelona face Athletic Bilbao later on Wednesday in a repeat of last year's final, leading 2-1 from the first-leg.
Atletico boss Diego Simeone named his strongest available side bar Miguel Angel Moya replacing Jan Oblak in goal, but the hosts paid for not making the most of a strong start.
Griezmann's fierce effort was collected by Celta 'keeper Ruben Blanco at the second attempt before Saul Niguez just failed to finish after running half the length of the field through the Celta defence.
However, Simeone's men were unusually slack at the back as they conceded three goals for the first time in a year.
A short corner caught the hosts napping and Hernandez rose highest at the back post to nod home.
Atletico were given a lifeline when Blanco failed to hold Yannick Carrasco's shot from the edge of the area and Griezmann was on hand to slot home his 19th goal of the season.
However, Celta were rewarded for a dominant second-half display that could have been rewarded with an even more convincing scoreline.
Guidetti was furious when he cut the ball back for Iago Aspas to slot home only for the linesman to signal the ball had already gone out for a corner.
The Swedish international wasn't to be denied moments later, though, as he picked up a loose ball inside the Atletico half and smashed a shot into the top corner.
Correa nearly breathed new life into Atletico when he hit the bar from Luciano Vietto's through ball.
Hernandez then killed the tie off when he was again unmarked to head home Hugo Mallo's cross just after the hour mark.
Correa reduced the arrears with a brilliant solo goal nine minutes from time, but it was too little, too late from Atletico, who bow out at the last eight for the second consecutive season.