Juventus' hopes of qualifying for the Champions League took a nosedive after a 2-0 defeat by Bologna.
Di Vaio returns to stun former club with both goals for Bologna
Juventus' hopes of qualifying for next season's UEFA Champions League took a further nosedive following a surprise 2-0 home defeat by Bologna.
Former Juve striker Marco Di Vaio did the damage as the veteran marksman struck twice in the second half to earn the visitors the points.
Juve's second loss in a row, coming after a defeat by the same scoreline at Lecce last weekend, leaves the Bianconeri three points adrift of the top five and struggling for a place in Europe next season.
The first 45 minutes were largely uneventful with the only moment of danger arriving in the 43rd minute when Vincenzo Iaquinta hit the post as the ball bounced around the penalty area.
Both sides struggled to make their mark on the game and Luigi Delneri's reaction at half-time was a bold one.
He brought Alessandro Del Piero and Luca Toni on for the second half, playing with four forwards in a bid to open the game up.
The move worked, but not exactly how he had planned it.
Di Vaio put the visitors in front in the 49th minute when he beat the offside trap to latch onto Massimo Mutarelli's finely-weighted pass and lift the ball over Marco Storari just before Giorgio Chiellini could recover.
Juve did create a good chance to level in the 65th minute when Leonardo Bonucci met Del Piero's free-kick at the far post, but he could not get enough on the ball to nudge it across the line, and Miguel Britos cleared the danger.
Within a minute, Di Vaio added the second. He picked up the ball to the left of the penalty area and dribbled past both Bonucci and Zdenek Grygera before beating Storari inside his near post.
The fans vented their frustration and Delneri gambled again with Simone Pepe coming on as a fifth forward instead of the full-back Grygera.
However, it was a defender, Bonucci, who came the closest to scoring when his header went just inches wide of the post from a corner.
A goal-line clearance from Daniele Portanova in the 84th minute summed up Juve's day as he prevented Toni from grabbing a consolation for the hosts.
