Walter Mazzarri must have been surprised by this result. Because it turns out that his team actually had to suffer a very bad defeat. Napoli controlled more of the ball but they had difficulty creating attacks in the match. And I think Walter Mazzarri made a late decision in the second half. Because he should have introduced the core players more quickly in the second half. But he did it too late because when the main players were put on the field at that time Napoli had already lost several goals. In fact, if Walter Mazzarri could bring on Osimhen and the others at the start of the second half then I don't think Napoli would be lost big like that. This result really disappointed everyone. In fact, I'm sure many people bet on Napoli in that match.
Napoli performance under Walter Mazzari can't consistent on every match after unbelievable result achieving defeated by Frosinone on Copa Italia round of 16. I think fatal mistake with current starting line up from Napoli and Walter Mazzari made many rotation but its not effective yet because they loss over 4-0 from Frosinone in front of their fans. Made several players substitute on second half match not really help for Napoli for scoring goals because conceded two goals when many players change including Victor Osimhen can't contribution well for helping Napoli lead to quarter final of Copa Italia.
Over confidence against Frosinone as team have under lower position than Napoli on Serie A make Walter Mazzari use their second composition and its not worth yet how fighting motivate from Frosinone players success cored four goals.