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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.