Yeah, this is quite disappointing for Dortmund because it could be overtaken and ultimately end in a draw. With the same score, Dortmund in the second leg must do it very optimally. It's true that Dortmund is actually much stronger and more effective than PSV, but they were quite unlucky in the first game yesterday. so they have to be successful in the second leg later.

Finally, Barcelona made it. A goal by Lewandowski
0  :  1
Napoli vs Barcelona
in the 60th minute it really could open up a chance of victory for Barcelona. The key is in them themselves. Their part can optimally direct the ball into the opponent's goal. Because that's not easy enough, Barcelona must fight even harder. However, at least with this 1 goal, it has been able to make the players more motivated to compete very well and effectively.

On the other hand, What's the matter with Arsenal?
Even though they controlled the ball, they still couldn't score at all. And they always failed when they tried to advance towards Porto's defense. This Porto guy is really cool, able to repel all the attacks that Arsenal wants to give. It seems Arsenal are starting to get confused about the strategy they should apply here. In fact, they really couldn't even shoot on target.