Napoli head into half time leading Cagliari by a two-goal margin courtesy of a Jose Callejon strike and a Antonio Balzano own goal at the Stadio Sant'Elia.
The Spanish winger broke the deadlock on the 25th minute as he received an inch-perfect pass from Marek Hamsik before finishing coolly with only Zeljko Brkic to beat.
The lead was doubled on the stroke of half time, as Antonio Balzano put past his own goalkeeper, giving Rafael Benitez's side a two-goal advantage at the break.
Cagliari struggled to offer many chances throughout the first half, as Napoli look dominant in the first 45 minutes.
