Roma completed a stunning 3-0 victory over Barcelona Tuesday to advance to the Champions League semifinals on away goals after the aggregate score of their quarterfinal finished 4-4. The unlikely result comes after Roma trailed 4-1 following the first leg.

Via the Independent, Edin Dzeko put Roma up 1-0 six minutes in after latching on to a long pass from Daniele De Rossi and putting the ball past Barca goalkeeper Marc-Andre ter Stegen from six yards out. But Barca failed to capitalize on several first half opportunities, including two where Lionel Messi missed the target on free kicks in the 8th and 28th minutes.

Conversely, De Rossi cemented the lead early in the second half after finding the back of the net on a penalty shot in the 56th minute to put Roma ahead 2-0. Roma scored its third and final goal to make it 4-4 on aggregate with eight minutes remaining.

It was Barca’s first defeat in either La Liga or the Champions League this season, but it was a big one. For the third straight year, the favorites have been knocked out of the Champion’s League in the quarterfinal stage. Meanwhile, Roma could potentially be three games away from what everyone figured was impossible.