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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.
Even though they are still favorites, Arsenal are still under pressure after achieving poor results in the first leg. Porto which is still consistently maintaining its performance, only needs a draw in this match to qualify for the quarter-finals. Porto's last two matches were also very impressive, they managed to score 8 goals without conceding. A strong defense was Arsenal's threat in the second leg, Porto only needed to close the space so that Arsenal players could not easily build attacks.
The chance of Arsenal qualifying to the next round is slimmer compared to that of Porto. Porto is very strong and seems difficult to win recently, we saw that in their recent games. Arsenal is equal to the task but only if the can score more goals than Porto at Emirate tomorrow that is what will give them the best chance of qualifying.
Hey, if Porto chooses to settle for a draw then it will be difficult for Arsenal since drawing the match will send Arsenal packing out from the league. If Porto draw, they win. If Porto win the match, it is a win win, but if they lose 1-0 to Arsenal, they still have hope. It is only if they lose with two goals gap that Arsenal is free. If Arsenal draw a the match, they are out. If the lose the match they are out, if they win without two goals difference it is 50-50 odds that they are will stay or get out of the league.