Defending champions AC Milan piled the pressure on Juve 24 hours earlier when they closed the gap to just one point after winning at Parma.

But Juve rose to the challenge despite going an early goal down to Goran Pandev's superb solo effort.

The home side drew level before the break when Ruben Olivera headed home Mauro Camoranesi's cross and Ibrahimovic sealed the win 15 minutes from time at the Delle Alpi stadium.

French midfielder Olivier Kapo broke down the right and left Lazio's defence for dead and his intelligent cutback was volleyed in from close range by the predatory Sweden international.

Juventus have 35 points from 14 maches, while Milan have 31, six more than third-placed Udinese who edged second from bottom Siena 1-0.

Cagliari and Palermo climbed to fourth and fifth respectively with home wins.

Former Chelsea hero Gianfranco Zola scored twice in Cagliari's 4-2 victory against Chievo, while Palermo beat bottom club Atalanta 1-0.

Roma's hopes of climbing into the top half of the table were dented after they were held to a 1-1 draw at home to Sampdoria.

Sampdoria took the lead nine minutes from time when substitute Biagio Pagano headed home Fabio Bazzani's flick.

But Totti salvaged a point for Roma by converting a penalty after Bazzani had fouled Traianos Dellas in the box.

His successful spot-kick made him Roma's joint all-time top scorer in Serie A, level with Roberto Pruzzo on 106 goals.