Marek Hamsik and Paolo Cannavaro struck the goals for the Neapolitans as they cruised to victory.
If Juventus avoid defeat on Sunday they will return to the summit, but Napoli look like strong title contenders at present.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.