A sixth successive Serie A title for Juventus might not be the foregone conclusion it appeared to be at the start of the season.
Cracks have started to appear and Juventus lost its perfect start to the season on Sunday as Inter Milan came from behind to win the Derby d'Italia 2-1.
Mauro Icardi and substitute Ivan Perisic scored for Inter to cancel out Stephan lichtsteiner's opener.
"We couldn't hold out for even two minutes (after scoring)," said Juventus coach Massimiliano Allegri. "It's brought us back to earth, we will have to fight. This defeat hurts us but at least it will do us good.”
Juventus, which also drew 0-0 against Sevilla in the Champions league, was very much second best at San Siro for large periods — and this against a team which lost 2-0 at home to Hapoel Beer-Sheva in the Europa league on Thursday.
Inter had won just one of its first three league matches. Coach Frank de Boer, who replaced Roberto Mancini less than two weeks before the start of the season, was very much under pressure amid reports of being fired if the Nerazzurri lost heavily to its bitter rival.
Even the sending off of midfielder Ever Banega in the final minute, following two yellow cards in quick succession, could not dampen Inter's spirits as it held out to seal a first home win over Juventus in more than six years.