Juventus maintained their 100 per cent record at the start of the Serie A season with a 2-0 victory at previously unbeaten Lazio last night.
But fellow giants Milan suffered more misery as they were held 0-0 at promoted Livorno.
Martin Caceres scored his first goal for Juve and David Trezeguet wrapped up the scoring deep into injury time to take the Old Lady of Turin three points clear at the top, for a day at least.
Trezeguet made his first start of the season with Italy striker Vincenzo Iaquinta rested following his midweek international exploits and the former Monaco man was lively early on.
Twice in the first quarter of an hour he had shots from corners but Lazio goalkeeper Fernando Muslera was alert enough to save.
On 21 minutes Serbia international Aleksandar Kolarov went close for the hosts with a long range free-kick that Gianluigi Buffon did well to parry.
The half finished in controversy when Lazio midfielder Stefano Mauri put the ball in the net only for the referee to chalk it off.
Juventus centre-back Nicola Legrottaglie, deputising for rested Italy captain Fabio Cannavaro, flopped to the ground as the ball pinged around the visitors' box, with the ball hitting his arm before Mauri slammed home the rebound.
However, the referee gave a free-kick to Juve for a foul on Legrottaglie.
Early in the second period Amauri came close to heading home a Fabio Grosso cross from six yards but the ball brushed off his head and away to safety.
But Uruguayan Caceres, a summer signing from Barcelona, rammed home a half-volley on 72 minutes after Trezeguet and Amauri had caused havoc in the box.
And the Frenchman put the cherry on the cake with virtually the last kick of the match, shooting in off Muslera from close range.
Woeful Milan had stand-in goalkeeper Marco Storari to thank for salvaging a point against Serie A minnows Livorno.
Just two weeks after their meek surrender against bitter city rivals Inter, Leonardo's men were second best against a team expected to struggle to stay up this season.
Ronaldinho was virtually anonymous and hauled off for Andrea Pirlo soon after the interval.
Pirlo came closest to scoring in the second period, crashing a free-kick against the bar but that did little to mask another disappointing performance and result for the seven-time European champions.
Leonardo, though, remained defiant and insisted his team were on the right path.
"They showed a great desire to win. Our second 45 minutes were good, we created many chances and I was convinced that at any moment we could score," he said, before defending his Brazilian compatriot Ronaldinho.
"If the team plays badly, then so does he. But that's enough judging individuals. He's irreplaceable for this team, as are all the players."