Defending Formula 1 world champion Sebastian Vettel has said that he is relishing his title challenge after winning the Singapore Grand Prix.

The German came from third on the grid to claim only his second victory of the season after Lewis Hamilton was forced to retire with a broken gearbox.

The Red Bull driver has cut Fernando Alonso's lead to 29 points in the drivers' championship but knows that it will take a lot for him to claim a third consecutive title.

"It's great to get the win," Vettel said. "Looking at the race, Lewis had to retire which is a shame for him. I know how it feels and have been in that position before. I think we could have had a tight battle.

"I felt very good on the harder tyres and we had a lot of pace. I think it's very good to get this win here. We know the next few races will be tough, but that's the challenge."

The next race is the Japanese Grand Prix on October 7.