Winning: Red Bull driver Sebastian Vettel of Germany.

Winning: Red Bull driver Sebastian Vettel of Germany.

REIGNING formula one champion Sebastian Vettel rattled off his fourth successive win of the season in the Indian Grand Prix to tighten his grip on the 2012 title with three races remaining.

The 25-year-old German led all the way from his pole-position start to pull 13 points clear of Ferrari's Fernando Alonso, who finished 10 seconds behind in the race near Delhi. Vettel's Red Bull teammate Mark Webber took third place ahead of McLaren duo Lewis Hamilton and Jenson Button.

It was Vettel's 26th win and he revelled in his familiar trick of adding the fastest lap of the race in the final lap and then standing atop of his car to milk the applause from the crowd.

Aiming to become formula one's youngest triple champion, the German said: ''Two years and two wins here, it's a very special grand prix; I don't know what it is about this circuit. A big thanks to my team; we're all pushing very hard. This is another good step [to the title] for us but there is still a long way to go.''

Alonso said: ''It's not easy at the moment to fight with Red Bull, but we will never give up.''

The only danger to Vettel in an otherwise seamless success came in the closing laps when sparks sprayed out from under his car's front spoiler, but there was no apparent damage.

The next race is on November 4 in Abu Dhabi, where Vettel won his first world title in 2010.