The match I'm curious about the most is Lazio - Udinese now. I wouldn't expect to say such thing before the season started. 
But now we are seeing these teams doing a great work in the league. They are nearly the same taking their statistics into account. The only visible difference is that Lazio conceded 5 less goals than Udinese so far. Even their head-to-head match history is very balanced considering the recent ones.
This match is truly one of the decisive matches between the two, whether their position will remain the same or there will be a takeover. Overall, their points (Lazio, Udinese, and also Milan are the same, namely 20 points. Only the difference in the number of goals affects it. So this will be an exciting match. We also can't predict who will play better and consistently so we can win the match. But now we are seeing these teams doing a great work in the league. They are nearly the same taking their statistics into account. The only visible difference is that Lazio conceded 5 less goals than Udinese so far. Even their head-to-head match history is very balanced considering the recent ones.Although they weren't really a very big club in the past compared to clubs like Inter, Milan, Roma, and Juventus, in fact, this season, their performances have been epic and consistent.