Porto vs Arsenal 1-0. Arsenal as a whole dominated the game but Porto's very strong defense made it difficult for Arsenal to score goals.
And Porto's 1 goal in the remaining extra time scored by Galeno in the 90+4 minute was a painful goal for Arsenal.
Arsenal has learned the lesson so maybe in the second leg at home in the Emirates Stadium they will be more attacking from the first half and make sure that they are able to get equal before the halftime mark. Arsenal can score more than one goal in a game as they have shown many times in this season, so it is possible that they turn things around in the second leg. The defeat was painful, but this is what the game is about, I think.
Napoli are lucky that the Victor Osimhen in the just finish African cup that missed many good chances is not the same Victor Osimhen in Napoli who scores with the slightest opportunity. His goal stole the joy away from Barcelona.