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.
Meanwhile in La Liga, defending champions Barcelona had to come from 2-1 down to beat Real Betis 3-2.
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