Inter Milan missed the chance to move five points clear at the top of Serie A as Scott McTominay scored twice to earn a draw for Napoli, who had manager Antonio Conte sent off.
Inter went ahead in the ninth minute when Federico Dimarco latched on to Marcus Thuram’s pass and fired home from an acute angle.
Eljif Elmas played a ball into the path of McTominay, who burst into the box and scored at the near post to equalise for Napoli with 26 minutes played.
The hosts went back in front in the 73rd minute when Hakan Calhanoglu’s thunderous penalty went in off the post with goalkeeper Vanja Milinkovic-Savic diving the wrong way.
Amir Rrahmani was judged to have caught Henrikh Mkhitaryan in the box – and Conte was dismissed for his angry reaction to the decision.
However, Napoli drew level once more through McTominay’s superb first-time finish into the bottom corner nine minutes from time.
Inter are three points ahead of rivals Milan while Napoli move up to third, level on points with Roma.
Cristian Chivu’s side have the chance to increase their lead to six points when they host Lecee on Wednesday (19:45 GMT).
