Inter Milan stretched their lead at the top of Serie A to six points, but only after coming from two goals down to beat lowly Pisa 6-2.
Pisa stunned the visitors through two goals from Stefano Moreo, a stunning 40-yard lob followed by a powerful header.
But Piotr Zielinski’s penalty and a header from Lautaro Martinez hauled Inter level before Pio Esposito put them in front at the end of a crazy first half.
Federico Dimarco hit the fourth with a volley which went in off both posts, Ange-Yoan Bonny scored a fine solo goal and Henrikh Mkhitaryan’s stoppage-time header wrapped up the scoring.