The Uruguayan netted twice to help the Naples outfit close the gap on Juventus at the top of the table.
Cavani had failed to score in eight games previously but remains the top goalscorer in Serie A.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.