MILAN: A coach-less but stubborn Sampdoria put the brakes on Napoli’s Serie A title ambitions by holding the Neapolitans to a scoreless draw at the San Paolo on Sunday.

Napoli had hoped to close the gap on Juventus to just two points after the championship leaders were stunned 1-0 by Francesco Totti’s rocket strike for Roma on Saturday.

But three days after a shock 3-0 defeat at home to Viktoria Plzen in the Europa League, Walter Mazzarri’s side failed to conjure a goal for the second match in succession.

“This is not good enough,” said Mazzarri.

“If we want to be up there challenging we need more. We need consistency, it makes me angry when we show up and have these unexplainable performances.”

Despite Juve’s slip-up the champions are still four points ahead of Napoli on 51 points, with Lazio a distant third (44) ahead of their trip to Siena on Monday.

AC Milan, 2-1 winners over Parma on Friday, remained fourth after Inter, in fifth at one point adrift of the Rossoneri, suffered a crushing 4-1 defeat away at Fiorentina.

Both Adem Ljajic and Stevan Jovetic scored a brace to claim the Viola’s first league win over Inter in 12 games, with Antonio Cassano scoring a late consolation for the visitors.

Inter had beaten CFR Cluj 2-0 in the first leg of their Europa League last 32 tie on Thursday, but the defensive lapses that were to haunt them throughout this match became apparent early.

After three minutes Jovetic shot straight at Slovenian Samir Handanovic in the Inter net after beating the offside trap to run on to David Pizarro’s long through ball.

Fiorentina took a deserved lead in the 13th minute after Serbian striker Ljajic headed home from Jovetic’s head-on following good build-up play on the left.

Serb midfielder Zdravko Kuzmanovic created Inter’s best chance of the half after he pounced on a loose ball to send a snap shot past Emiliano Viviano’s upright on 28 mimutes.

But five minutes later Montenegrin striker Jovetic capitalised on more shaky defending by strolling unchallenged along the area and sending a rocket past the rooted Handanovic into the roof of the net.

La Viola should have doubled their lead again before half time when both Borja Valero and Alberto Aquilani forced saves from Handanovic. Inter were found wanting again barely 10 minutes after the restart when a saving tackle from deep in defence left the ball ricocheting around the area before it fell to Jovetic, who gave Handanovic no chance from 10 metres out.

Ljajic made it 4-0 for the hosts on 65 minutes when he danced into the area after collecing Valero’s pass from the left to beat Handanovic down low with a dipping shot.