Napoli's Serie A title defence nears end with Lazio defeat
With five matches remaining in their respective league seasons the reigning champions trail Inter by 12 points following a poor display in Naples.
Matteo Cancellieri's early tap-in set the tone at the Stadio Diego Armando Maradona, and Toma Basic made sure of a fine win for ninth-placed Lazio with another simple finish in the 57th minute.
Lazio's performance was a good sign for their Italian Cup semi-final against Atalanta, which is delicately poised at 2-2 ahead of Wednesday's second leg in Bergamo.