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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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.