As we move into round four of the Serie A season, it's clear that there has been some significant movement in the standings. Here is a rundown of who is currently ahead and who is on the edge.

At the top of the league, Juventus is currently leading with six points from their first four games. They have won all three home matches so far, including a dominant performance against AC Milan last weekend. However, they face a tough test against Atalanta this week, which could be crucial for their title defense.

Another team to watch out for is Lazio, who sit second with five points from their opening four fixtures. They've had a mixed start to the season, but they've shown plenty of promise in recent weeks. They'll need to keep up their form if they want to challenge for the top spot.

In third place, Napoli have also made a strong start to the season, sitting just two points behind Juventus. They've played well defensively, conceding only one goal so far, while scoring seven goals themselves. Their next game sees them take on Inter Milan, a match that could prove pivotal in determining who will finish in the top three at the end of the campaign.

Finally, there's Sampdoria, who occupy fourth place with four points from their opening four games. They've struggled somewhat, conceding four goals in their first three matches, but they did manage to secure a draw against Roma earlier this month. With a tough fixture list coming up, they'll need to continue improving if they want to make a push for a top-four finish.

Overall, there's plenty of excitement in Serie A heading into round four. Teams are jostling for position, and any slip-ups can see them fall down the table. It should be an exciting few months as teams vie for the title and playoff spots.