Alexis Sanchez hit the leveller within the 1/3 minute of stoppage time of a enjoyable encounter in Turin which left Inter in third, 4 factors behind Milan.
Simone Inzaghi's facet have a game in hand, but they're now looking over their shoulders at Juventus, who're simplest three points at the back of their antique competitors in fourth after stringing together a 14-healthy unbeaten run.
That would have been unthinkable on the turn of the year whilst Inter have been 4 points clear at the pinnacle and 12 beforehand of Juve.
Sanchez's equaliser was laid on through Edin Dzeko, who changed into Inter's worst culprit in front of intention after heading just extensive on the hour and then nodding over from point-blank variety moments before his Chilean teammate did the honours.
However Inter may want to effortlessly have lost after a deeply disappointing show.
After Brazilian defender Bremer gave the hosts the lead with eleven mins long past, Samir Handanovic brilliantly tipped huge Armando Izzo's free header within the 64th minute.
Seconds before Robin Gosens had stored his goalkeeper with a desperate lunge to stop Josip Brekala from scoring what would had been a brilliant individual aim after the Croatian worldwide weaved his wave into the box.
They were additionally saved by using the officials while Andrea Ranocchia turned into ruled to have not fouled Andrea Belotti inside the location nine minutes before the wreck.
Victor Osimhen struck the primary of his brace for Napoli within the 14th minute on the Stadio Bentegodi by thumping domestic an excellent header from Matteo Politano's cross.