AC Milan missed the chance to close within a point of Serie A leaders Inter Milan on Saturday when they were held 0-0 at AS Roma.Second-placed Milan were on top for most of the match and Klaas-Jan Huntelaar headed over a glorious chance to break the deadlock in the closing stages.Juventus boosted their Champions League qualification hopes with a 2-1 victory at Fiorentina that lifted them to fourth.Roma made an aggressive start at a packed Stadio Olimpico with Daniele De Rossi shooting just wide and Julio Baptista forcing a decent save from Christian Abbiati with a powerful strike early on.But Milan gradually worked their way into the match and they were in control by the middle of the first half.Marco Borriello blasted wide a good chance set up by Ronaldinho's threaded pass and Roma defender Nicolas Burdisso was lucky an attempt to head away a Mathieu Flamini cross did not fly into his own net.The visitors continued to make the running after the break and Roma's Julio Sergio just managed to scramble the ball away in the 55th when Borriello burst into the area and aimed inside the near post.Roma were more dangerous after striker Luca Toni came on just before the hour as he returned from a calf injury that had sidelined him since January.Mirko Vucinic nodded a fine opportunity wide and Abbiati did well to repel a John Arne Riise piledriver in stoppage time.Milan coach Leonardo had sprung a surprise by giving Huntelaar injured Alexandre Pato's place in his attacking trident rather than David Beckham, who set up a good chance for Ronaldinho after coming on in the 72nd minute.The England midfielder will hope he was being rested for Wednesday's visit to his former club Manchester United in the Champions League last 16, when Milan need to reverse a 3-2 deficit.In Florence Italy full back Fabio Grosso, who came on as a substitute at the start of the second half, fired home what proved to be the winner from a tight angle in the 68th minute.Juve's Brazilian playmaker Diego had dribbled past keeper Sebastien Frey and slotted into an empty net to give the visitors the lead in the second minute after Antonio Candreva had sprung the offside trap with a smart pass.Former Juve midfielder Marco Marchionni headed the home side level in the 32nd when Alex Manninger, standing in for injured Italy goalkeeper Gianluigi Buffon, came out to intercept a cross but missed the ball.Faltering Fiorentina, who host Bayern Munich on Tuesday in the Champions League last 16, are 10th. Palermo regained fourth place in Serie A on Sunday when Fabrizio Miccoli's late goal gave them a 1-0 home win over relegation-threatened Livorno.Miccoli drove into the corner in the 81st minute to snatch victory after Livorno keeper Rubinho looked like he might be able to frustrate the Sicilians with a series of fine saves.Palermo have 46 points from 27 games, sufficient for a place in the Champions League preliminaries, and two points more than Juventus who won 2-1 at Fiorentina on Saturday.Inter Milan drew 0-0 and maintains 4 points up after second-placed AC Milan drew 0-0 at third-placed AS Roma on Saturday.Sampdoria are also in the chase for Champions League qualification after a 2-1 comeback win at home over Lazio that puts them one point behind Juve in sixth.Stefano Guberti's piledriver and a volley by Giampaolo Pazzini clinched it in the first half after Sergio Floccari's early opener for the Rome club.Lazio, who are just three points above the relegation zone, had Mauro Zarate sent off for dissent in the 77th.Samp fans favourite Antonio Cassano came off the bench in the second half to return after an injury layoff and friction with coach Luigi Del Neri that almost led to him joining Fiorentina in the transfer window.Cagliari forward Andrea Cossu, who made his Italy debut against Cameroon on Wednesday, scored in the 74th to give the Sardinians a 2-2 home draw with Catania shortly after they had Michele Canini sent off for a second yellow card.Napoli are seventh after they went down 2-1 at Bologna, a result that means they have now gone six matches without a win.

Results: Atalanta Udinese 0 - 0 Bari Chievo 1 - 0 Bologna Napoli 2 - 1 Cagliari Catania 2 - 2 Fiorentina Juventus 1 - 2 Inter Genoa o - 0 Palermo Livorno 1 - 0 Roma Milan 0 - 0 Sampdoria Lazio 2 - 1 Siena Parma 1 - 1

Rankings: Inter 59  Milan 55 Roma 52  Palermo 46  Juventus 44  Sampdoria 43  Napoli 41  Cagliari 39  Genoa 39  Bari 35  Fiorentina 35  Chievo 35  Parma 34  Bologna 34  Udinese 28  Catania 28  Lazio 26  Livorno 23  Atalanta 22  Siena 21