Two goals from Krzysztof Piatek helped AC Milan come from behind to beat Atalanta 3-1 away in Serie A and move four points clear in fourth place.
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Dark horses Atalanta moved within one point of Serie A's Champions League places by beating Cagliari 1-0 on Monday.
Juventus' hopes of winning the treble have been ended after they were knocked out of the Coppa Italia 3-0 by Atalanta.
Atalanta forward Duvan Zapata missed a penalty but scored an equaliser one minute later as his side hit back from three goals behind to draw 3-3.
Atalanta forward Josip Ilicic came off the bench to score a hat trick in the last 20 minutes in a 6-2 victory over Sassuolo.
Racist chanting from Inter's fans marred their 1-0 win over Napoli, but the violence and fan death outside the San Siro showed the worst of Italy.
Cristiano Ronaldo came off the bench to rescue Juventus a point in a 2-2 draw against Atalanta and extend their unbeaten run to 18 games.
Lazio defender Francesco Acerbi suffered double frustration on Monday when he was booked for celebrating what he thought was a stoppage-time equalis
Napoli substitute Arkadiusz Milik scored with a sublime volley after coming off the bench to snatch a late and precious 2-1 win at Atalanta.