Massimiliano Allegri's decision to rest two key players backfired as Juventus lost valuable ground in the Serie A title hunt with a 3-2 defeat at Sampdoria.

Allegri kept Gianluigi Buffon and Andrea Barzagli on the bench after Italy's recent emotional World Cup failure, and watched as the home side raced into a three-goal lead.

Duvan Zapata opened the scoring in the 52nd minute before Lucas Torreira and Gianmarco Ferrari added two goals in eight minutes to effectively seal an impressive win.

Juventus rallied in injury time through a Gonzalo Higuain penalty and a second from Paulo Dybala, but it was not enough as they slipped four points behind leaders Napoli.

Captain Icardi opened the scoring six minutes into the second half at the San Siro when he powerfully met Antonio Candreva's right-wing free-kick.

And the Argentina striker claimed his 13th goal of the season nine minutes later, stooping to nod Danilo D'Ambrosio's in-swinging centre into the bottom left corner as Inter made it 13 games without defeat this season.

At the other end of the table Benevento were denied their first point of a dismal campaign by an injury-time winner from visitors Sassuolo to steal a 2-1 win.

Samuel Amenteros scored a 65th-minute equaliser for the hosts to cancel out Alessandro Matri's earlier effort - but Federico Peluso won it for the visitors four minutes into injury time.

Fiorentina salvaged a late point in a 1-1 draw at SPAL, Federico Chiesa's 80th-minute strike coming after Alberto Paloschi had put the hosts in front. SPAL substitute Marios Oikonomou was sent off in injury time for a second bookable offence.

And Torino also grabbed a 1-1 draw at home to Chievo, who had led through Perparim Hetemaj's early opener before the hosts hit back through Daniele Baselli. Chievo were also reduced to 10 men through the late sending-off of Ivan Radovanovic.

Udinese goalkeeper Albano Bizzarri also saw red late on in his side's 1-0 home defeat to Cagliari, who grabbed the only goal through Joao Pedro after 54 minutes.

Luca Rigoni's early goal was enough to give Genoa their first win in five Serie A games with a 1-0 victory over fellow strugglers Crotone.