Juventus extended their lead at the top of the Serie A table to five points thanks to Sunday's 4-0 hammering of Verona, while Milan's woes continued with a 1-0 home defeat by Atalanta.
Massimiliano Allegri's men destroyed Verona 6-1 in the Coppa Italia on Thursday and Juve were rampant once again, capitalising on Roma's 1-1 draw at Palermo on Saturday to extend their lead at the summit.
While a Giampaolo Pazzini header landed on the roof of the net, Stefano Colantuono's side were able to frustrate their hosts and pick up only a second away league win of the campaign - and their first since September.
Napoli left Rome with all three points after beating fellow UEFA Champions League hopefuls Lazio 1-0 in the day's early match.
Gonzalo Higuain's emphatic 18th-minute strike settled it in favour of Rafael Benitez's men, who reclaimed third spot as a result, while Lazio finish the weekend fifth.
Genoa's winless run was stretched to five matches, but they avoided suffering a fourth defeat in five as they salvaged a 3-3 draw at home to Sassuolo.
The visitors went ahead three times, with Domenico Berardi netting twice, but Genoa pegged Sassuolo back each time and ultimately snatched a point thanks to Ioannis Fetfatzidis' stoppage-time penalty.
Sampdoria remain level with Napoli on 33 points after a routine 2-0 win at rock-bottom Parma, while Fiorentina's last-gasp 2-1 victory at Chievo keeps them just three points behind.
