I'm Naples and Napoli supporter: thanks for welcoming me in this forum.
Manchester City will win this match for the simple reason that its game is very similar to that of Napoli, with the difference that Citizens have more technical quality.
Naples historically suffers its similar teams, and today Napoli's main strength is to play against weaker teams and then, having opened the match with the goal of the advantage, playing in counterattack and score so many goals.
This pattern goes well in the Serie A championship where 18 teams on our 19 opponents are weaker than our team.
In Europe, where obviously there are much stronger teams, this system does not work.
So I agree with the general line of this thread that sees Manchester City winning.
I disagree with who believes that it is enough to block Mertens to block Naples. That is not the case.
Napoli has several players who can pick up the identity of Mertens and let's not forget that the actual Mertens version as goal scorer, is something very recent: it was born last year following the accident of Milik. First Mertens was a wing that played relatively little, the owners were Insigns, Callejon and Milik.
For Sarri's play, anyone who plays as a central striker scoring many goals. Me too :D
With the departure of Higuain (for which I did not despair, since Juve is disappointing) Napoli has become a co-op of the goal and the game.
Underestimate the rest of the team thinking that blocking Mertens is enough to win the game, it can be a fatal mistake for you.
If you play as you know, making the perfect match, you can not only win but also score 4-5 goals.