Luis Suarez continued his incredible season with a further two strikes against Atletico Madrid, taking his tally to 45 goals in 45 matches in all competitions.
The Uruguayan may have been fortunate to remain on the pitch after his wild kick against Juanfran in the first-half.
At that point, Barcelona had trailed their opponents by 1-0 after Fernando Torres had given the away side the lead after 25 minutes.
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But 10 minutes later, Torres was sitting in the Atletico Madrid changing room after he picked up two needless yellow cards.
Luis Enrique’s side couldn’t find a way through in the remainder of the first 45 minutes but they turned on the style in the second-half.
They bombarded Jan Oblak’s goal and finally equalised when Suarez tapped in from Jordi Alba’s mis-kick.
It wasn’t long before Suarez gave Barcelona the lead - 11 minutes in fact.
Suarez laid the ball off to Dani Alves, who produced a brilliant first time cross onto the head of the former Liverpool forward who bulleted his header into the back of the net.
Check out both the goals below:
The 2-1 scoreline leaves the semi-final finely poised ahead of the second-leg at the Calderon next week but Atleti will be ruing the fact that they let their 1-0 lead slip after Torres stupidly got himself sent-off.
Forget about El Clasico defeat
Barcelona would have been feeling the pressure after Saturday's surprising El Clasico defeat at home to Real Madrid on Saturday.
The loss against Madrid ended their 39-match unbeaten run and they desperately needed to bounce against Atletico Madrid as they look to complete a historic double-treble.
The Catalan club will be delighted that they can now forget about that crushing loss as they aim to win everything once again.
Despite the Clasico loss, Luis Enrique's side remain six points clear at the top of league as they hope to win their their 24th league title. They are also in the final of the Copa del Rey where they will face Sevilla.
And, after their first-leg triumph, they will be setting their sights on conquering Europe once again.
But this quarter-final tie is far from over. Diego Simeone's men will know that a 1-0 victory would be enough to see them progress on away goals. That scoreline might have been possible at the Nou Camp had they not have been reduced to 10 men with 55 minutes left to play.