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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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.