Red Bull’s Mark Webber might still be favourite to clinch the Formula One drivers’ title, but Fernando Alonso has other ideas after his stirring victory in the Singapore Grand Prix.

The Ferrari driver scored a vital win under the lights of the Marina Bay street circuit, holding off a full-race charge from Sebastian Vettel, to leave the championship wide open with four races to go.

Webber leads with 202 points ahead of Alonso on 191.

McLaren’s Lewis Hamilton, who failed to finish for the second race in a row, has 182 with Vettel a point further adrift and reigning world champion Jenson Button on 177.

Alonso has now scored more points than anyone else over the past five races to put him in firm contention for a third world title and he fancies his chances.

“I think it remains very tight. All five contenders still have the same possibilities,” he said.

“Mark has a little bit more with still some margin to have a bad weekend not putting at risk the contention of the championship.

“For the others we need to keep catching if we can. We will do our best. We do not know if it will be enough to become champion in Abu Dhabi. But we will give 100 per cent. Hopefully it is enough but people can be sure we will fight until the end.”

The Spaniard, who won his 25th race on Sunday, added that it was inevitable that Ferrari, Red Bull and McLaren would have ups and downs between now and the last race of the season in Abu Dhabi.

“Having a championship that is nine months doesn’t happen in many other sports,” he said.

“We are a sport where you can’t be 100 per cent fit and focused for all races, we go up and down and that’s normal. This year it feels like the championship is starting now.”

The F1 circus moves to Japan next, on October 10, and then South Korea is scheduled to host its inaugural race.

After that comes Brazil before the finale in Abu Dhabi.