Alonso not writing off anyone yet

The Ferrari driver took his fourth win of the season at Marina Bay to move into second place in the standings, 11 points behind Red Bull's Mark Webber.

Lewis Hamilton's hopes suffered a big blow after he retired from the event.

The Briton is now third, 20 points behind Webber, with Sebastian Vettel one point further behind and Jenson Button 25 adrift of Webber with four races left..

"It remains very tight. All five contenders are still more or less with the same possibility," the Spaniard said. "Mark has a little bit more margin to have a bad weekend. For the others we need to keep catching up if we can.

"We will do our best, we won't know if it will be enough to win the title in Abu Dhabi but people can be sure we will fight until the end."

He added: "In these four races any of us can win two or three consecutive races and be in a good position, but if you make mistakes you can be off the championship. We need to keep our concentration - hopefully with no mistakes and hopefully we keep the same way in Japan as well."

Alonso, who had to cope with race-long pressure from Vettel, finished just two tenths of a second ahead of the German.

The Spaniard admitted it has been a very tough race.

The two-time champion conceded the win meant a lot to him.

"It was very difficult," said Alonso. "We knew that before coming here. We know Singapore physically is the toughest race this season, with two hours in humidity on a street circuit. It was tough to drive.

"This win means a lot. We know Singapore is a unique track and we could confirm the car is performing well.

"This win means a lot to stay in the fight for the championship. We know there are four races to go. It seems we can be competitive in any track. Great job by the factory and the team to get 100% of potential all the time. Forza Ferrari!"