With Ibrahimovic joining the Rossoneri from Barcelona, the pressure was on the young Brazilian and Pato responded with two goals inside the opening 29 minutes as Massimiliano Allegri's first game in charge ended in a comprehensive victory.

Thiago Silva scored in between Pato's strikes as newly-promoted Lecce endured a tricky return to the top flight.

Veteran striker Filippo Inzaghi grabbed a late fourth to complete the win and send Milan - albeit after just one game - to the top of the table.

Bari shocked Juventus with a 1-0 win at the Stadio San Nicola.

A stunning goal from Massimo Donati just before the interval was enough to decide the game in Bari's favour and see the Bianconeri, who came into the season with high hopes and expectations, suffer their first setback.

Sampdoria claimed their first win in a Serie A opener at the Luigi Ferraris stadium since 1997 by beating Lazio 2-0.

Samp striker Antonio Cassano opened the scoring from the penalty spot on the hour mark and Stefano Gubertis lobbed in a second.

Brescia endured a disappointing return to the top flight as Parma eased to a 2-0 win thanks to first-half efforts from Valeri Bojinov and Stefano Morrone.

Sergio Pellissier converted an 84th-minute winner as Chievo got their campaign off to the desired start at the expense of Catania.

Belgian striker Davide Moscardelli put the home side in front after quarter of an hour but Catania's Adrian Ricchiuti drew the scores level inside seven minutes.

Fiorentina drew 1-1 with Napoli in a match that saw sendings off for Juan Manuel Vargas and Manuele Blasi, while Palermo and Cagliari endured a goalless 90 minutes,