The Milan derby took place on Sunday.
Zlatan and his Milan had a chance to take back the league lead from Inter - but had a tough night.
Zlatan had several dangerous goal chances and the first situation came after a quarter played.
With his back to the goal, he tried to heel the ball, but Samir Handanovic saved.
At the score 1-0 he was close to equalizing - twice over.
But Zlatan was speechless and then replaced in the 75th minute.
Instead, Inter showed why they top the table.
Scored goals in five straight Milan derbies
Lautaro Martínez needed just five minutes to break the deadlock.
In the beginning of the second, he extended the lead to 2-0.
Romelu Lukaku then fixed the final score at 3-0.
The goal meant that he is the first player to score in five straight Milan derbies.
The victory for Inter means that they are now four points ahead of Milan in the table.