Inter Milan roared back from two goals down to hammer promoted Pisa 6-2 on Friday and move six points clear at the top of Serie A.
Fans at a soaking San Siro were left in shock by Stefano Moreo's early brace, including a brilliant chip over Inter goalkeeper Yann Sommer from near the halfway line.
But Piotr Zielinski's penalty in the 39th minute sparked a comeback at the end of the first half, with strike pairing Lautaro Martinez and Pio Esposito both thumping home powerful headers to put Inter ahead at the break.
Federico Dimarco, Ange-Yoan Bonny and Henrikh Mkhitaryan rounded off the scoring in the final 10 minutes to secure Inter's ninth win in a 10-match unbeaten run in the league.
A sensational performance from @Inter_en! ⚫️🔵 pic.twitter.com/mETqdwEQzW
— Lega Serie A (@SerieA_EN) January 23, 2026
"When I came on, the idea was to score one before halftime and after that it would have been a long second half (for Pisa)," said Dimarco, who was introduced shortly before Zielinski scored.
"But we scored three, we reacted well. Sometimes, when you play a lot of games, you can approach a game the wrong way, but it was important to turn it around."
Inter's thumping victory piled pressure on title rivals AC Milan and Napoli, who both have tough away fixtures this weekend.
A closer look at #InterPisa 🤯🔍 pic.twitter.com/oAoAcPe7yU
— Lega Serie A (@SerieA_EN) January 23, 2026
Inter's closest challengers, Milan, travel south on Sunday to take on fourth-placed Roma, who are yet to win a high-profile fixture but continue to improve under Gian Piero Gasperini.
Meanwhile, Napoli are nine points back in third, with the champions in Turin on Sunday after a draw at 10-man FC Copenhagen left them at risk of being eliminated from the Champions League.
Pisa are bottom of the division, having collected just four points from their last 10 matches.
This heavy defeat came after a dream start in the Tuscan side's first match against Inter at the San Siro since October 1990.
The 5 000 away fans roared their delight when Moreo pounced on a poor Sommer pass to fire back over his head into an empty net in the 11th minute before the Italian forward doubled the away side's lead with his head midway through the first half.
But Alberto Gilardino's team crumbled once Zielinski struck, and Pisa ended up conceding the same number of goals to Inter that they did over a quarter of a century ago.