Napoli maintained their perfect start to the Serie A season on Sunday with a 2-0 win over Cagliari which ensured they reclaimed top spot, while Lazio won an eventful derby 3-2 to down Jose Mourinho's Roma.

Luciano Spalletti's side cruised to their sixth victory in as many league games against a Cagliari team coached by former Napoli manager Walter Mazzarri thanks to Victor Osimhen's sixth goal in all competitions this month and a second-half penalty from Lorenzo Insigne who pre-match celebrated his 400th Napoli appearance.