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Napoli drew 0-0 with Torino on Sunday, their third goalless draw in four Serie A games.
A goal from on-loan Chelsea defender Ola Aina earned Torino a 1-0 win in a rollercoaster Serie A encounter against Udinese on Sunday.
Torino coach Walter Mazzarri was left fuming with the refereeing after Nicolas N'Koulou was sent off during his side's 0-0 draw at SPAL.
Third-placed Inter Milan gave a toothless display as they slumped to a 1-0 defeat at Torino in Serie A on Sunday.
Lazio's Champions League hopes took a knock on Saturday when they were held to a 1-1 draw at home by Torino in a bad-tempered game.
Inter notched a big win over Napoli on Boxing Day, albeit one overshadowed by sad events around the pitch. Elsewhere, Roma must get it together.
Cristiano Ronaldo converted a second-half penalty as Juventus beat Turin 1-0 in the local derby.