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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Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.