We can call it an unlucky day for Arsenal after several attempts ended in vain, but even if Porto win today they are not safe yet because Arsenal can turn things around in the next match we also know Arsenal can beat anyone who comes to their home base. Napoli and Barcelona only played a draw even though Barcelona dominated, they couldn't win it. The results of today's match are almost the same as yesterday's match and each team still has a chance in the second leg match.
I wouldn't want to agree it was really an unlucky day for Arsenal because through the first half of the game there was some kind of balance and Porto did played well too so both team at some point had some even performance but then Arsenal did gave their best as it was very obvious they wanted only but a win, nevertheless they weren't able to get a good to help them being to reality their dreams.
Well it actually looks magical how Porto won this game but realistically Porto in their domestic league had really been of a very good performance a d they had lost on a few games they have aswell tried to be amongst the top team I'm their league aswell so it shouldn't have been too much of a surprise for them to have won but then they weren't appearing like they had the matching capacity to really get arsenal t lose a game as this against them, to think it was a champions league knock out game, Porto now have a home goal advantage and if they managed to get another when they visit the Emirates stadium, even with Arsenal winning, Porto may still qualify except Arsenal wins with a good goal margin ahead of Porto.