Barcelona's Robert Lewandowski, left, and Dortmund's Waldemar Anton compete for the ball during the Champions League quarterfinals second leg soccer match between Borussia Dortmund and Barcelona, at the Signa-Iduna Park in Dortmund, Germany. AP
After being swept aside 4-0 in the first leg of the quarterfinal, Dortmund had nothing to lose and attacked Barcelona from the start, leaving the visitors off-balance.
Guirassy had missed chances in the first leg and spurned a couple more early in Tuesday's game but made no mistake from the penalty spot in the 11th minute after Barcelona goalkeeper Wojciech Szczesny collided with Pascal Gross.
Guirassy's header made it 2-0 in the 49th minute before an own goal by Ramy Bensebaini made Dortmund's task even harder. Guirassy completed his hat trick with a powerful close-range shot in the 76th, in the process becoming the Champions League's top scorer this season on 13 goals.
It gave Dortmund fresh hope of completing what would have been one of the all-time great Champions League comebacks, but Barcelona held on to progress.
Barcelona faces either Inter Milan or Bayern Munich in the semifinals.
(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)
Short link: