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Mercedes Formula One driver Lewis Hamilton of Britain celebrates his victory in the Italian F1 Grand Prix in Monza, northern Italy September 6, 2015. Image Credit: Reuter

Monza, Italy: Lewis Hamilton extended his lead, at least provisionally, in this year’s drivers’ world championship to 53 points on Sunday when he drove to a flawless and consummate victory in a typically dramatic Italian Grand Prix.

As nearest rival and Mercedes teammate Nico Rosberg retired with a blown engine with two laps to go, Hamilton took full advantage on a day when his perfect drive ended amid chaotic scenes and reports that his car had raced with illegal tyre pressures.

Hamilton led from pole position to the chequered flag, leading all the way and surviving a nervous period during the final laps when, warned by his team, he became aware of possible performance problems.

His points advantage, with seven ‘flyaway’ races remaining after the last European race of the season, makes him a clear favourite to defend his crown and claim his third world title.

The newly-blond defending two-time world champion came home 25 seconds ahead of Sebastian Vettel of Ferrari with former local hero Felipe Massa finishing third for Williams, repeating his podium of last year.

Hamilton’s win if confirmed was his second in succession at the Autodromo Nazionale, his third in all at the famous old circuit, his seventh of the season and 40th of his career.

“Those last few laps were not cool man,” Hamilton told his engineer over the team radio, after being asked to push harder and not ask questions. “Not cool.”

Behind Massa, Valtteri Bottas came home fourth in the second Williams ahead of Kimi Raikkonen in the second Ferrari and Sergio Perez of Force India.

Nico Hulkenberg was seventh in the second Force India ahead of Australian Daniel Ricciardo of Red Bull, Swede Marcus Ericsson of Sauber and Russian Daniil Kvyat in the second Red Bull.

As the race ended, it became clear that the result was under scrutiny and expected to remain unconfirmed until the outcome of a stewards’ inquiry into the starting pressures and temperatures of the McLaren cars.

Bizzarely, this postscript unfolded as the Star Wars film director George Lucas conducted the post-race podium interviews. “Do blondes have more fun?” Lucas asked Hamilton, who had dyed his hair before arriving in Italy. “I hope so,” he replied.

“Look at this crowd, it’s incredible,” added Hamilton who, not knowing what else had happened, went on to praise his team. “This team is remarkable. What we’ve achieved together is so special ...

“I’m incredibly grateful to them. They’ve done a great job all year.”

Asked about his allegedly irregular tyre pressures, Hamilton said he knew nothing about it. “I didn’t know a thing,” he said.

In his 50th race since joining Mercedes, Hamilton had made a perfect start as, behind him, Raikkonen stalled and, with cars weaving around him, Vettel powered into second place in pursuit of the championship leader.

Raikkonen’s misfortune gave the two Williams a chance to take third and fourth with Massa leading Bottas behind Vettel, the top five stretched out by Hamilton’s early speed as he opened a lead of 5.9 seconds by lap 10.

Rosberg, in a car fitted with an older Mercedes engine following a coolant leak on his updated new unit on Saturday morning, passed Perez for fifth, but found it more difficult to overhaul Bottas as the race order settled.

There was first lap despair for the Lotus drivers with both Romain Grosjean and Pastor Maldonado both forced into retirement with mechanical problems.