The chance for Napoli to win in the second leg is very small. Although that doesn't mean they don't have a chance, it's just that the chance is very small. In contrast to Arsenal, even though today they lost in the first leg, I'm sure they are still optimistic about turning things around in the second leg. But the problem is that Porto's defense is quite famous for its solidity. And it's possible that Porto will try to survive in the second leg and make it even more difficult for Arsenal to score goals. And if Arsenal is careless, Arsenal could even concede in the second leg.
Honestly, I hope Arsenal scores lots of goals in this match. But I was quite disappointed because Arsenal was really unable to break down the opponent's defense.
Even after having terrible game Napoli able to bring themselves to the level which is impressive, but now things are surely going to be toughest for them in Spain while they will go and try to have win which could be not easy even we can say still both teams are in game for the win because in last few games at home Barcelona is also facing trouble but still advantage with them for having win and go through for the quarterfinal with both are at the same level of performance and both are also having problems which are needed to be fixed.
Arsenal vs Porto is surely the biggest disappointment for the fans because mostly were feeling they could be having the good number of goals but sadly at the end we have only one goal from the Porto into injury time which give them good win, and now we have to wait for the second leg game with how Arsenal will perform.