MONZA, Italy - McLaren's Lewis Hamilton added the Italian Grand Prix to his list of Formula 1 victories while Ferrari's Fernando Alonso overall championship lead is decreased with third place.Sauber rookie Sergio Perez denied Alonso second place, overtaking the Ferrari ace seven laps from the finish - and that after disposing of Alonso's team mate Felipe Massa.Hamilton's third win of the season, and 20th of his career, lifted the 2008 champion to second in the overall standings with seven races remaining. Alonso has 179 points, Hamilton 142 and Lotus's Kimi Raikkonen 141.BACK IN THE HUNTHamilton said: "It's been fantastic to win here. I'm just so happy for my team, it's been a fantastic day." 2011 champion team Red Bull had a nightmare afternoon in the sunshine with both Sebastian Vettel, the reigning champion, and Mark Webber retiring late in the race while in scoring positions.Vettel, Alonso's closest rival in the standings before the start, retired six laps from the finish and slipped to fourth overall with 140 points.BUTTON RETIRESVettel had already taken a drive-through penalty after pushing Alonso wide and on to the gravel and grass as the Spaniard tried to overtake out of the first Lesmo curve. McLaren's Jenson Button, winner in Belgium and runner-up in Monza for the previous three years, pulled over on to the grass along the pits straight and retired on the 33rd of the 53 laps while in second place.While Hamilton celebrated his first victory at Monza, the big winner was Alonso who got the loudest cheer of the afternoon when he appeared on a podium suspended over the track and above a sea of red-shirted fans roaring their support and unfurling a giant Ferrari shield.Alonso, who failed to score in Belgium after being shunted out in the multiple crash in the first corner, had started 10th after a mechanical problem had denied him a likely pole in Saturday's qualifying. "It was a difficult race starting from 10th," he said, "but we knew we had maybe the quickest car this weekend."A perfect Sunday because the win was out of reach... it's much better than expected."FANTASTIC PEREZLauda took his hat off, literally, to Perez for another astonishing drive by the 22-year-old. The young Mexican Sauber driver said: "It's unbelievable to have a podium for my team at Monza. It's very special. I went for prime tyres at the start and I decided to stop late. That gave me very fresh tyres at the end. It's unbelievable." Massa finished fourth, denied a first podium since 2010 by team orders that obliged him to let Alonso through on lap 40. He had seized second from Button at the start before the Briton regained his place and was second again after Button retired.Raikkonen, Ferrari's 2007 champion, finished fifth with former Ferrari great Michael Schumacher sixth and his Mercedes team mate Nico Rosberg seventh.Young Scotsman Paul Di Resta was eighth for Force India with Kamui Kobayashi giving Sauber a double scoring finish in ninth and Bruno Senna 10th for Williams.The start, always a cause for concern at the fastest circuit on the calendar, was clean with the first big incident coming on lap nine when Toro Rosso's Jean-Eric Vergne lost control and skidded across the track, lifting well into the air. He walked away afterwards. 2012 Italian Grand Prix results1 Lewis Hamilton (Britain) McLaren 1min19min41.2212 Sergio Perez (Mexico) Sauber - Ferrari +4.356sec3 Fernando Alonso (Spain) Ferrari +20.5944 Felipe Massa (Brazil) Ferrari +29.6675 Kimi Raikkonen (Finland) Lotus +30.8816 Michael Schumacher (Germany) Mercedes +31.2597 Nico Rosberg (Germany) Mercedes +33.5508 Paul Di Resta (Britain) Force India - Mercedes +41.0579 Kamui Kobayashi (Japan) Sauber +43.89810 Bruno Senna (Brazil) Williams 00min48.14411 Pastor Maldonado (Venezuela) Williams +48.68212 Daniel Ricciardo (Australia) Toro Rosso +50.31613 Jerome d'Ambrosio (Belgium) Lotus +1min15.86114 Heikki Kovalainen (Finland) Caterham +1 lap15 Vitaly Petrov (Russia) Caterham +1 lap16 Charles Pic (France) Marussia +1 lap17 Timo Glock (Germany) Marussia +1 lap18 Pedro de la Rosa (Spain) HRT +1 lap19 Narain Karthikeyan (India) HRT +1 lap20 R Mark Webber (Australia) Red Bull +2 laps21 R Nico Huelkenberg (Germany) Force India +3 laps22 R Sebastian Vettel (Germany) Red Bull 6 laps R Jenson Button (Britain) McLaren 21 laps R Jean-Eric Vergne (France) Toro Rosso 45 laps (rank: R = retired, nc = not classified)Fastest lap: Nico Rosberg, 1min27.239, lap 53. Drivers' and Constructor' points after the Italian GPDrivers 1 Fernando Alonso (Spain) Ferrari 179 2 Lewis Hamilton (Britain) McLaren 142 3 Kimi Raikkonen (Finland) Renault 141 4 Sebastian Vettel (Germany) Red Bull 140 5 Mark Webber (Australia) Red Bull 132 6 Jenson Button (Britain) McLaren 101 7 Nico Rosberg (Germany) Mercedes GP 83 8 Romain Grosjean (France) Renault 76 9 Sergio Perez (Mexico) Sauber 65 10 Felipe Massa (Brazil) Ferrari 4711 Michael Schumacher (Germany) Mercedes GP 4312 Kamui Kobayashi (Japan) Sauber 35 13 Paul Di Resta (Britain) Force India 32 14 Nico Huelkenberg (Germany) Force India 31 15 Pastor Maldonado (Venezuela) Williams 29 16 Bruno Senna (Brazil) Williams 25 17 Jean-Eric Vergne (France) Toro Rosso 8 18 Daniel Ricciardo (Australia) Toro Rosso 4 19 Heikki Kovalainen (Finland) Team Lotus 0 20 Vitaly Petrov (Russia) Team Lotus 0 21 Jerome d'Ambrosio (Belgium) Renault 0 22 Timo Glock (Germany) Marussia 0 23 Charles Pic (France) Marussia 0 24 Narain Karthikeyan (India) HRT 0 25 Pedro de la Rosa (Spain) HRT 0Constructors1 Red Bull 272 2 McLaren 43 3 Ferrari 226 4 Lotus 217 5 Mercedes 126 6 Sauber 100 7 Force India 63 8 Williams 54 9 Toro Rosso 12 10 Caterham 0 11 Marussia 0 12 HRT 0Stay with Wheels24 for the Italian GP weekend.