Inter Milan are top of the table after a thrilling 4-2 derby win over AC Milan.
Inter Milan launched a superb second-half comeback from 2-0 down to stun rivals AC Milan and go top of Serie A.
Inter started in third but leapfrogged Lazio and head the table on goal difference from champions Juventus.
Ante Rebic tapped home from Zlatan Ibrahimovic's knockdown and the Swede headed in the second before the break.
But Marcelo Brozovic volleyed in and Matias Vecino stroked home Alexis Sanchez's cutback before Stefan de Vrij and Romelu Lukaku both scored headers.
Antonio Conte's side looked beaten at half-time after a lethargic opening 45 minutes, but responded in sensational fashion in the second period with four unanswered goals.
Both sides hit the woodwork in a thrilling derby, Hakan Calhanoglu smashing the post with a low drive and Ibrahimovic heading against the post late on, while Inter's January signing Christian Eriksen rattled the crossbar with a long-range free-kick.
Lukaku stated at the final whistle: “The second half was wonderful. I think we allowed them too many spaces in the first half and Milan deserve congratulations for their performance in the first half.
“We played with a different level of intensity after the break and in the end we deserved it. The first half was tough for us, but everyone in the stadium saw the mentality of this Inter, our refusal to give up and our desire to win.
“I always say that the most important thing I do is work for the team. I am here to win, we won this evening and I am very happy. Now we prepare for the next matches.
“All this is thanks to my teammates, the coach and his staff. When I arrived in Italy, I knew it was the toughest league for a striker to score goals, but they have really helped me to settle in."