Borussia Dortmund have opened up a 3-0 aggregate lead with an away goal at Porto.
Just over 22 minutes into the second leg, Dortmund have made a monumental task even tougher for Porto, taking a 1-0 lead off an own goal from Iker Casillas.
Dortmund once again proved how dangerous they can be on the counter attack as a turnover at midfield led to an odd-man rush for BVB.
Henrikh Mkhitaryan got the ball on the right flank and sent in a cross towards a wide open Marco Reus. The German attempted a volley but was denied by the ageless Iker Casillas.
However, Casillas punched the ball right to an onside Aubameyang who sent a shot off the crossbar. The ball bounced off the foot of Casillas and into the net.
The goal was credited to Aubameyang originally but looked to be an own goal as the initial shot was not going in after hitting the bar. The goal was eventually credited as an own goal to Casillas.
For Porto to advance, they will have to score four times and keep Dortmund off the board.