The Old Lady needed more than 90 minutes to progress to the next round ahead of their opponents, who were indebted to Agliardi for a virtuoso goalkeeping performance
For the vast majority of the second-half, Federico Agliardi's goalkeeping heroics kept the hosts at bay until Emanuele Giaccherini's 90th minute strike appeared to steal victory. However, Andrea Raggi headed home a corner in the 95th minute to send the match into extra time. Once there, a brilliant individual goal by Claudio Marchisio settled the tie in Juventus' favour.
The first half was not one for the purists, with both sides struggling to establish any kind of attacking rhythm. The most notable moment for the visitors came courtesy of Daniele Vantaggiato, who forced Marco Storari into a diving save from a free-kick 23 minutes in.
Juventus were not faring any better, with Milos Krasic at the heart of what little they created in the opening period. The Serbian first had a goal correctly chalked off for outside, before teeing up Fabio Quagliarella for a shot that was blocked by Agliardi a few minutes before the break.
The hosts began the second-half with renewed vigor, and could have broken the deadlock barely a minute after the restart. Quagliarella’s effort from 12 yards out was parried by Agilardi into the path of Krasic, who could not find the target from the rebound with the goal at his mercy.
Agliardi was called into action again soon after, first stopping a low drive by Alessandro Del Piero with his trailing leg, before tipping away a belter by Quagliarella at full stretch following a swift counter-attack.
Antonio Conte’s men continued to create chances, and Del Piero should have done a lot better in the 57th minute, dragging his finish wide when a missed header by Raggi left him one-on-one with the keeper.
The Bianconeri skipper had another chance ten minutes later from a free kick, but Agliardi was again equal to his effort and smothered the ball low at the far post.
The Bologna keeper produced an even better save in the 70th minute, showing stunning reflexes to divert Gianccherini’s piledriver from the edge of the area just over the bar.
However, Giaccherini would not be denied, and finally broke the visitors' resistance on the stroke of injury time with a goal of some quality. The substitute burst from midfield, storming past two players before drilling his finish high into the back of the net.
Just when it seemed like Juventus had stolen a berth in the quarter-finals, Bologna managed an equaliser five minutes into injury time from the unlikeliest of sources. A corner from the right was headed in emphatically by Raggi to send the tie into an additional 30 minute period.
The home side controlled the first half of extra time, and regained the lead just as the game clock moved into triple digits. There did not appear to be a lot of space for Marchisio to work with when he was fed near the penalty spot, but the Italy international evaded his marker with a clever shimmy before planting his finish expertly into the bottom corner.
Bologna posed little threat of an equaliser, and Juventus could have increased their tally in the time that remained, but some more inspired goalkeeping by Agliardi kept the scoreline respectable. With the win, the Serie A leaders become the first side to seal their place in the Coppa Italia quarter-finals.