August 14th 2020 will now be seen as the most embarrassing European night in the history of FC Barcelona - as they were humiliated 8-2 by German champions Bayern Munich at the Estadio da Luz.
Bayern put on an attacking masterclass in Lisbon and were 4-1 up at half time, with goals coming from Thomas Muller, Ivan Perisic, and Serge Gnabry.
The Bundesliga champions netted another four goals in the second half to complete an 8-2 victory, with the goals coming from Joshua Kimmich, Robert Lewandowski, and on-loan Barcelona man Philippe Coutinho even got it on the act.
Bayern boss Hans-Dieter Flick named an unchanged side from his teams' 4-1 win against Chelsea in the last-16 matchup last Thursday.
Story of the game
The first chance of the match fell to Leo Messi, who broke at speed and spread the ball wide to Sergi Roberto, the Spanish international whipped the ball into the box but Bayern defender Jerome Boateng got a vital touch on it to force a corner.
Almost immediately after Barca's attack, Bayern Munich took the lead as Thomas Muller swept the ball into the bottom-right corner after a quick one-two play with Robert Lewandowski.
Bayern's lead only lasted three minutes as Barcelona quickly equalised - Jordi Alba found space on the left-hand side and crossed the ball towards Luis Suarez at the back-post, defender David Alaba got there before the Uruguayan, but could not stop the ball from looping over Manuel Neuer and into his own net.
Barcelona had a good chance to turn this game entirely on its head after Nelson Semedo's through ball evades Alaba and sent Suarez one-on-one with Neuer, but the German number one made a crucial save to keep the game level.
A minute later, Barcelona hit the post as Messi's cross missed four Barca players who were completely unmarked in the box, and struck the woodwork before going out for a goal-kick.
Barcelona's good spell continued as Messi went on one of his trademark runs into the box, he unleashed a shot on his left-foot but Neuer was equal to it and made a comfortable save.
After soaking up the Barca pressure, Bayern retook the lead after just 21 minutes - Sergi Roberto was robbed of the ball by Serge Gnabry, who made an inch-perfect pass to Ivan Perisic on the left-hand side, the Croatian smashed the ball beyond Marc Andre Ter Stegen at full stretch to restore the advantage.
Bayern's hard work was almost undone as Jerome Boateng nearly found his own net after Barca overloaded the left-hand side.
Next, Leo Messi managed to find Clement Lenglet with a ball into the box, but his header was wide of the post and was then flagged for offside.
Bayern Munich got their third goal on just 27 minutes - Leon Goretzka exquisitely chipped the ball over the top of the Barca defence and Gnabry made no mistake in front of goal as he fired the ball past a helpless Ter Stegen.
Ter Stegen's night almost got worse as his pass out from the back was intercepted by Robert Lewandowski, but the German goalkeeper redeemed himself with a save from point-blank range to deny Bayern's top goalscorer.
Bayern got their fourth goal on 31 minutes as Thomas Muller got in front of Lenglet and poked the ball home from six yards after a perfect cross from Joshua Kimmich.
The last real chance of the half fell to Luis Suarez, he got a good connection on his shot but his effort was straight at the goalkeeper.
Bayern's attacking masterclass continued in the second half
Bayern continued their attacking relentlessness after the restart as Muller held the ball up and teed up Perisic for a shot, but his effort was straight at Ter Stegen.
Leon Goretzka ran between the two Barcelona central defenders and latched onto a ball from Kimmich but his effort flew well over the bar.
Lewandowski had a goal chalked off for offside after Thomas Muller set him up from an offside position.
Barcelona got a foothold back into the game on 57 minutes as Jordi Alba found Suarez in space on the edge of the box, who picked up the ball and skinned Jerome Boateng before thumping the ball beyond Manuel Neuer.
But just six minutes before Barca were given a beacon of hope, that hope was dashed as Joshua Kimmich fired into an empty net after a stunning run and assist from Alphonso Davies.
Nelson Semedo lost the ball in a dangerous position to Thomas Muller who played in substitute Kingsley Coman, but the Frenchman could not convert with his first touch of the game.
Leo Messi had some rare space in the Bayern Munich box on 77 minutes after being freed by Suarez, but his shot was comfortably saved by Neuer.
Robert Lewandowski finally got his goal after on-loan Barcelona man Philippe Coutinho crossed the ball across the box and the Poland-native headed home from close range.
Coutinho's evening got even better as he completed one of the most embarrassing nights in Barcelona's history as he got the seventh goal, which was created by Muller.
The Brazilian also got the eighth goal as Thiago played a ball wide to Lucas Hernandez, who set up Coutinho for his second goal of the game.
Coutinho's celebrations were muted out of respect for his parent club, but Barca were disrespected throughout the entire game by Bayern's sheer attacking brilliance.
After victory tonight, Bayern Munich will face the winner of tomorrow night’s clash between Manchester City and Lyon in the semi-final’s.
Where does Barcelona go from here?
Tonight's annihilation confirmed a trophyless season for The Blaugrana, something which is unheard of and simply unacceptable for a club of that stature.
The result this evening epitomises the failure this season has been and it seems only a matter of time before manager Quique Setien is relieved of his duties.
Bayern's monumental victory tonight was a huge step towards becoming Champions League winners for the sixth time - and a message to every single remaining side in the competition.
It was an attacking clinic, a total decimation of a Barcelona side who certainly are no pushover - regardless of their lacklustre performance tonight.
Hans-Dieter Flick is a manager that is not a household name as of yet, but after that masterclass, he is a boss that now resonates in the forefront of the footballing world.