Napoli rejoined Juventus at the top of Serie A with a 1-0 win at 10-man Sampdoria on Sunday, as the southern club seeks its first Italian title since Diego Maradona first led it to glory.
Edinson Cavani converted a penalty for Napoli in the 67th for his league-best sixth goal of the season after six rounds.
Daniele Guastaldello was given his second yellow card for tripping Marek Hamsik at the edge of the area to set up the penalty.
Replays showed that the penalty may have occurred just outside the area.
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