Because Dortmund lost the first game 4-0, they had nothing to lose on Tuesday. They attacked Barcelona from the beginning, and Barcelona were surprised.

Barcelona coach Hansi Flick said the second game would be hard because of the fans, even though his team was winning by four goals.

Flick told Amazon Prime he thought this would happen. He said Dortmund played well and won, and his team is now in the semifinals.

Barcelona's main goal scorers, Raphinha and Robert Lewandowski, usually score many goals. But in this game, they were very quiet and did not score.

Coach Niko Kovac said Guirassy is very important for Dortmund, like their 'life insurance' because he scores many goals. Guirassy is becoming famous fast and is now the best scorer in the Champions League this year. Kovac said Guirassy needs his teammates to help him, just like other players who score goals. His teammates helped him in the game today.

Dortmund lost the quarterfinal game in the first match. Their captain Emre Can and midfielder Carney Chukwuemeka could not play because they were injured that day.

For a time, Guirassy played very well and it felt like anything could happen.

Guirassy had chances to score in the first game. He also missed two chances at the start of Tuesday's game. But he scored a penalty goal after the Barcelona goalkeeper hit Pascal Gross.

Guirassy scored with a header to make it 2-0 in the 49th minute. Then, Ramy Bensebaini scored an own goal, making it even more difficult for Dortmund. Fermín López's low cross hit Bensebaini's ankle and went in. This was a double blow for Dortmund as Bensebaini had been important in their attempt to come back, assisting Guirassy's second goal shortly before.

Guirassy scored his third goal in the 76th minute. He shot the ball hard from close to the goal because Ronald Araujo made a mistake. Now he has 13 goals in the Champions League this season, and he is the top scorer.

This result gave Dortmund hope to make a great comeback, like Barcelona did against Paris Saint-Germain in 2017. But Barcelona kept their lead and won.

Barcelona will play against Inter Milan or Bayern Munich in the semifinals. This is the first time they have reached the last four teams in the Champions League since 2019. In the other game on Tuesday, PSG got to the semifinals by winning 5-4 in total against Aston Villa. They lost the second game 3-2, but still won overall.

Barcelona lost a game. This was their first loss since December 21st. They also lost in the Champions League for the first time since September. Before this, they always won against Dortmund.

Dortmund might not play in the Champions League at their stadium again soon.

Last year, the team was second in the Champions League. Now, they are eighth in their league. They have five games left and need six more points to be in the top four teams for the Champions League next year.