Maybe this is a problem of poor strategy for Napoli or because Barcelona is too good at managing the tempo of the game. Barcelona performed well from the first half and so far they have made 6 shots on goal out of a total of 11 shots. They can win this match and increase their chances of qualifying for the quarter-finals, so in the end perhaps this is why Barcelona should not be underestimated.
Barcelona failed heavily to secure their first winning against Napoli that's shaky in league matches. However there's another chance for Barcelona to step up their game, if they messed up this one, it's all going to be a long boring week for the supporters. Barcelona have returned back to winning streaks and they wouldn't take it easy on their opponents when they meet.
Although Barcelona did not win the away match against Napoli, I would not say that their performance was poor. The match was Napoli's home match. Even then we saw the dominance of Barcelona players. Napoli have failed to dominate at home. However, if the performance of Barcelona's attacking players was a little better, they might have been able to win the match. However, Barcelona are still dependent on Lewandowski to score. This is why Barcelona's performance has become erratic.
Their next game is Napoli and this is the second leg of the round of 16. Xavi Hernandez have to take it personal because it's in his last days of managing Barcelona where he's legend.
Barcelona's performance is erratic. Barcelona has no chance of winning the La Liga title. Xavi has already announced that he will not be with Barcelona next season. This was his last season with Barcelona. So Xavi will do his best to do well in the Champions League. Xavi is a good enough coach. On the other hand, opponent Napoli is not in a good rhythm. If Xavi can develop a consistent match strategy, Barcelona will be able to beat Napoli.