Sampdoria maintained their perfect home record and destroyed their Juventus taboo with a 3-2 victory over the Scudetto holders.
This was a huge test for Max Allegri, who rested Gigi Buffon, Andrea Barzagli and Paulo Dybala against a Samp side with a perfect home record this season.
The Blucerchiati had managed just one point from their last eight meetings with Juventus, home and away, since a 3-2 victory here in May 2013.
It took just two minutes for Gonzalo Higuain to have a great chance, his angled drive deflected wide by Matias Silvestre.
Fabio Quagliarella volleyed wide and Mario Mandzukic’s overhead kick was blocked again by Silvestre, but a crunching Stephan Lichtsteiner tackle forced Dennis Praet off with an injury.
Higuain had the ball in the back of the net, but only after he had been flagged offside from Juan Cuadrado’s long ball.
Emiliano Viviano performed a crucial yet unorthodox save to deny Cuadrado from close range, almost turning his back to deflect the shot across the face of goal from a tight angle.
Sami Khedira volleyed off target and with the last move of the half, Juve had penalty appeals for handball. However, Cuadrado’s cross seemed to bounce off Ivan Strinic’s leg first and then hit his hand.
It was Sampdoria who eventually got first blood at the end of a long move with Juve unable to clear, as Bernardeschi’s acrobatic attempt to get the Fabio Quagliarella cross away just looped into the air and Duvan Zapata steered a looping header into the far top corner.
It was very nearly 2-0 moments later, as Quagliarella sent Duvan Zapata clear on the counter, but Wojciech Szczesny came tearing out for a decisive save.
Max Allegri threw on Paulo Dybala and Juve immediately stepped up a gear, as Mandzukic just failed to get on the end of a Lichtsteiner assist, then Dybala and Miralem Pjanic follow-ups were charged down. Higuain ran the entire length of the pitch holding off defenders only for Cuadrado to not get there in time for the assist.
It proved costly, because Sampdoria doubled their lead. Lucas Torreira took a touch on the edge of the box and drilled a rocket into the far bottom corner.
Juventus fell apart and Sampdoria made it 3-0, Gianmarco Ferrari anticipating Khedira to tap in a Quagliarella pull-back from the by-line from six yards.
Douglas Costa went on a mazy run and Viviano stuck out a foot to parry, then the Brazilian was tripped by Ivan Strinic for a last-gasp penalty. Higuain converted and it seemed to be too little, too late.
However, Dybala then went on a passionate run and drilled into the bottom corner moments later to make it 3-2 in stoppages.