The Internazionale manager, Roberto Mancini, glowered from the touchline after watching the Brazilian Felipe Anderson score his first brace in Serie A – the Lazio midfielder’s second goal arrived at the end of a wonderful run – but the hosts refused to give up.
Mateo Kovacic halved the deficit with a stunning volley in the 66th minute to give Inter confidence. Then the striker Rodrigo Palacio scored his first goal of the season to spare his side from defeat with 10 minutes remaining.
The point was enough to lift Lazio into third place heading into the winter break, while Inter remain in 11th.
The Genoa club would have leapfrogged Napoli with victory at the Stadio Luigi Ferraris but, despite Pedro Obiang’s left-foot drive giving Sampdoria a 15th-minute lead, goals from Alex Geijo in the 31st minute and Danilo three minutes later gave Udinese the upper hand.
Sampdoria hit back with the forward Manolo Gabbiadini equalising on the hour mark. However, despite the dismissal of Thomas Heurtaux, for a second bookable offence, the hosts had to settle for a point.
Atalanta fought back from two goals down to earn a 3-3 draw against Palermo in Bergamo.
Luca Rigoni put Palermo ahead in the sixth minute and Franco Vázquez doubled the advantage 10 minutes later.
Germán Denis earned and converted a penalty to reduce the arrears in the 40th minute before Vázquez scored his second of the day to give Palermo a 3-1 lead at half-time.
However, second-half goals from Maximiliano Moralez and Denis earned the home side a deserved point.
Kamil Glik scored twice in the second half as Torino came from behind to beat Genoa 2-1 for their first league victory in nearly two months.
Iago Falque gave Genoa the lead three minutes before half-time but Glik equalised seven minutes after the restart. The Polish defender then headed home the winner in the 63rd minute to condemn Genoa to their first away defeat this season.
In a battle between two Tuscan teams in Florence Empoli held Fiorentina to a 1-1 draw to extend their unbeaten run to five games.
The Peruvian midfielder Juan Manuel Vargas scored his first goal of the season to put Fiorentina ahead in the 44th minute but Lorenzo Tonelli equalised shortly before the hour mark.
Elsewhere Alberto Paloschi scored the only goal of the game to hand Chievo a 1-0 win at Verona in the city derby. The Italian striker headed home Ervin Zukanovic’s cross nine minutes from time as Chievo won for the fourth time this season.