Napoli has fallen off from the first position as they could no longer keep to their consistency. Isaksen goal on the 79th minutes swept Napoli off their feet as they couldn't equalize the goal till the match ended, because Lazio defended the goal till the end to enable them walk away with three points from Diego Maradona Stadium. The farther till league gets, the tougher it becomes and only the strong will survive.
With Napoli's defeat in the match, of course, it has increased the level of difficulty in the competition for points in the standings because Lazio, who have played their fifteenth week, have also been able to collect 31 points which are generally the same as Fiorentina and Inter Milan even though the two teams have not played their fifteenth week match this season. But Lazio is currently no longer far behind Napoli and also Atalanta who are currently at the top of the Serie A standings.