~ Snip ~
Looking at the odds, Arsenal remains heavy favorite.
It's really worth to bet draw or Porto to win, looking at their previous match, Arsenal was struggling to beat Brentford while Porto is still strong until now. So I expect this match should ends in draw, Porto don't have to win while Arsenal will try their best to win.
I still think Arsenal can turn things around, because if we refer to their previous three matches, Arsenal consistently won, two of which were achieved with big scores. It would be a shame if the Gunners failed to catch up on the goal deficit, considering they will act as hosts at the Emirates. But if Porto plays with a defensive strategy, Arteta fleet will find it difficult to penetrate.
There is a possibility that the match will end in a draw, so Arsenal will be eliminated because Porto is 1 goal ahead. The second leg is the toughest test for Arteta fleet, his skill in formulating strategies will be determined in that match. Apart from that, Arsenal are often eliminated in the round of 16, Arteta must instill a winning mentality in his players, and must work hard to break this bad trend.
On paper, Arsenal deserves to be the favorite, they will get full support from their own fans, the Gunners don't want to see their fans disappointed and crying again. Now they have gained valuable capital and good confidence, in the EPL they have the luck to lead the standings.