Napoli missed the chance to move level with second-placed Roma in Serie A as they lost 1-0 at Torino on Sunday.
Sampdoria came from behind to beat Atalanta 2-1 on Sunday for their first win since January 18.
The Derby della Lanterna was unable to separate Sampdoria and Genoa as they drew 1-1 in Serie A on Tuesday.
Struggling Chievo moved four points clear of the Serie A relegation zone with a 2-1 win over Sampdoria on Sunday.
Roma beat Cagliari 2-1 to snap a four-game winless streak and close the gap on Serie A leaders Juventus to seven points.
Sampdoria lost further ground in the race for a spot in next season's Champions League after being held at home to a 1-1 draw by Sassuolo on Sunday.
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