(CNN)Few gave Liverpool a chance against Barcelona ahead of their Champions League semifinal against Barcelona on Tuesday.
Liverpool had also been weakened by the absence of a trio of key players through injury — Mo Salah, Roberto Firmino and Naby Keita. That meant Liverpool manager Jurgen Klopp turned to players like Divock Origi and Xherdan Shaqiri, who for much of the season have been confined to the substitutes bench.
Perhaps that’s the greatest tribute to Klopp’s man management skills, because both Origi and Shaqiri were vital to Liverpool’s 4-0 win. Origi scored twice, while Shaqiri set up Gini Wijnaldum for Liverpool’s third goal.
“We played against maybe the best team in world,” Klopp told BT Sport. “Winning is difficult, but winning with a clean sheet, I don’t know how they did it.
“Divock and Shaq didn’t play a lot. Putting a performance in like that, it was so important. It shows what’s possible in football. It’s so nice. It’s really nice.
“I saw James Milner crying on the pitch after the game. It means so much to all of us.”
But how does Liverpool’s remarkable victory rank against the competition’s greatest and most memorable matches?
Here’s a look back at some of the best.
Obviously, the list is not exhaustive, and there have been far too many great games to include them all. Still, let us know which ones we missed out on by leaving a comment on our Facebook page.
Manchester City 4-3 Tottenham Hotspur
Five goals in the first half. Seven by full-time. And another, potentially decisive strike, dramatically ruled out by the video assistant referee (VAR) in injury time.
Last month’s Champions League quarterfinal second leg between Manchester City and Tottenham Hotspur had absolutely everything.
With Spurs holding a slender 1-0 advantage from the first leg, the lead and momentum shifted multiple times at the Etihad stadium. When the dust settled, it was the London club that was victorious, triumphing on away goals and ending City’s dreams of an unprecedented trophy quadruple.
Arguably the greatest European final of all time. Liverpool looked to be on the end of a drubbing after an early goal from Paolo Maldini and a brace from Hernan Crespo, the second of which saw the Argentine latch onto one a sublime through ball from the Brazilian international Kaka, gave pre-match favorites Milan a 3-0 halftime lead.
But a rousing 15 minutes at the start of the second period saw Liverpool’s captain-fantastic, Steven Gerrard pull one back before Vladimir Smicer and Xabi Alonso leveled matters.
Extra time couldn’t separate the sides so penalties were required. Serginho and Andrea Pirlo missed for Milan before Liverpool goalkeeper Jerzy Dudek saved the decisive kick from Andrei Shevchenko to give Liverpool an unlikely and remarkable win.
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Deportivo La Coruna 4-0 AC Milan, 2004 quarterfinal
Sorry Milan fans, here’s another match you’d probably rather forget. Leading Deportivo La Coruna 4-1 from the quarterfinal first leg at the San Siro, Milan traveled to northwestern Spain as firm favorites to see out the tie.
But Depor had other ideas as goals from Walter Pandiani, Juan Carlos Valeron and Albert Luque put them ahead on aggregate using the away goals rule before halftime. Fran added a fourth in the second period to secure victory.
Depor’s surprise comeback was one of a number of upsets in the 2003-04 Champions League that saw an FC Porto side, coached by a young Jose Mourinho, win an unlikely final against Monaco.
After a goalless first leg in Munich, few expected this high-stakes affair to prove so entertaining.
The flying Finn, Jari Litmanen, put Ajax on its way but Bayern promptly leveled through Marcel Witeczek. Unperturbed, the Dutch team took control of the game before halftime with strikes from Finidi George and Ronald De Boer. Litmanen added another shortly after the break.
Bayern battled to get back into the game and did pull one back through a Mehmet Scholl penalty. But Marc Overmars extended the lead for Louis van Gaal’s young Ajax side with a late strike to make it 5-2.
Ajax would go on to defeat Milan in the final in Vienna.
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Barcelona 6-1 Paris Saint Germain, 2017 round of 16
Barcelona and Messi has achieved some magical things over the last 15 years. But this is right up there with the best of them. After a 4-0 pummelling in the Paris first leg, the Catalan club required all of their legendary firepower to overcome a strong PSG in the return.
Luis Suarez, a Layvin Kurzawa own goal and a Messi penalty put Barça 3-0 up and the comeback looked very much on. But Edinson Cavani scored what seemed like the vital away goal for PSG just after the hour mark.
That meant Barcelona needed another three goals to go through. As the clocked ticked down, such a scenario looked increasingly unlikely with PSG spurning a number of good chances. But Neymar gave Barça feint hope with a 88th minute free-kick. Two minutes later a second penalty was awarded and duly dispatched by the Brazilian.
The momentum was heading only one way, but time was running out. Step forward Sergi Roberto, an unlikely hero, who stretched to score from Neymar’s dinked cross and send the Nou Camp into raptures.
Prior to this game there had been 213 European games since 1955 where the first leg of a tie had finished 4-0. Such a deficit had never been overturned — until the Barcelona of Messi, Neymar and Suarez faced down PSG.