Lazio came from behind to defeat Cagliari 4-1 and top the Serie A table while Bologna scored an incredible away victory against Scudetto favourites AC Milan.

It was the round of the underdog as a 10-man Napoli came back from 1-0 down to draw against AS Roma at the Stadio Olimpico and Chievo came back to defeat Reggina 2-1.

Serie A newcomer Bologna pulled off a surprising 2-1 win over AC Milan at the San Siro on Sunday as Francesco Valiani scored with 11 minutes to play to hand his team all three points.

Marco Di Vaio gave the visitors a 1-0 lead in the 18th minute, but Milan was level before the break courtesy of a Massimo Ambrosini header. However, Bologna pulled off the upset when Valiani smashed a shot into the upper left corner from 25 yards.

After finishing second last season, Roma's campaign didn't start as planned either, with the team being held to a 1-1 draw by Napoli, while Torino handed newly-promoted Lecce a 3-0 defeat.

Lazio scored four times in the second half, including two from Mauro Zarate, to beat Cagliari 4-1, Atalanta slipped past Siena 1-0 on a goal from Simone Padoin, Vincenzo Italiano scored in the 88th minute to give Chievo a 2-1 win against Reggina and Catania earned a 1-0 win over Genoa on a second-half strike from Giuseppe Mascara.

Torino defeated Lecce 3-0 after goals Rosina, Paolo Zanetti and new signing Rolando Bianchi.

In Sunday's late game, Alberto Gilardino scored in the 89th minute as 10-man Fiorentina tied Juventus 1-1. Juventus grabbed the lead in the 39th minute on goal from Pavel Nedved, but Fiorentina eventually answered minutes after Felipe Melo was sent off.

New Inter Milan manager Jose Mourinho's debut did not go quite as well as he would have hoped as his side was held to a 1-1 draw by Sampdoria at Luigi Ferraris on Saturday.

Zlatan Ibrahimovic fired Inter ahead in the 33rd minute, but Sampdoria's Gennaro Delvecchio canceled the goal out with one of his own in the 70th minute.

 Udinese got off to a good start on Saturday with a 3-1 win against Palermo behind two goals from Antonio Di Natale. Mark Bresciano scored in the 69th minute for Palermo to make it a one-goal game, but Udinese's Gokhan Inler answered right back to restore the two-goal edge.

Serie A Table after Round 1