Rome  - Juventus waited until the second half to come from behind Saturday against lowly visitors Bologna and clinch a 4-1 win that pushed them within four points of leaders Inter Milan.

Hasan Salihamidzic levelled Bologna's first-half lead from Massimo Mutarelli before a goal from Sebastian Giovinco and an Alessandro Del Piero brace pushed Juve on
59 points from 28 games.

The Turin hosts missed injured Brazil striker Amauri, while Frenchman David Trezeguet remained sidelined after an alleged row with coach Claudio Ranieri.

Captain Del Piero and Vincenzo Iaquinta were by no means substitutes but had few chances upfront in the first half as Juve struggled to overcome the guests' five-man midfield, backing league top-striker Marco Di Vaio.

The former Juve forward has impressed this season with his 19-goal tally and on 24 minutes proved to be a valid playmaker as he set up Mutarelli for a winning shot under the legs of the onrushing Gianluigi Buffon.

A fast drive from the diminutive Giovinco on 37 minutes was Juve's first chance that met the brave save of Francesco Antonioli as Juve held the guests in their midfield.

The same Giovinco one minute later fed a great cross for Del Piero only to see the captain squander from a few metres away.

Juve's equalizer was postponed to the early minutes of the second half when Bosnian midfielder Salihamidzic connected with a corner kick and deftly nodded the ball inside the far post.

The fast and seemingly unmarkable Giovinco provided countless feeds upfront and had a close-range effort blocked by Antonioli as Del Piero missed two volleys before Buffon had to parry a dangerous header from Di Vaio.

Further missed chances from Del Piero and Swedish defender Olof Mellberg kept the Stadio Olimpico crowd cheering until Giovinco completed Juve's rally on 71 minutes, firing home a neat feed from Iaquinta.

Four minutes later, Del Piero secured Juve's win, leaving the defence standing to fire past Antonioli and rounded off with two minutes left, again off a Salihamidzic assist, before hitting a bar.

Earlier Saturday, Genoa moved up to fourth place, winning 1-0 at 10-man Cagliari through a late goal from substitute Ruben Olivera.

The win sees Genoa move ahead of Fiorentina, who play a daunting game late Sunday at Inter, after Roma visit Sampdoria looking to advance in joint-fourth position. dpa