Mark Webber said he was still smiling despite being forced to retire from the Indian Grand Prix.

The Australian was running in a solid second place behind team-mate Sebastian Vettel when alternator failure forced him to pull over into retirement.

It marked the second DNF for the Red Bull man in the last three races but despite the disappointment, Webber said he was proud of the fact that he couldn't have done more on track before the issue arose.

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"Obviously I'm pretty disappointed with today's race, but there is not much I can do," he said. "The alternator went wrong with very short notice so we had to stop straight away. It's tough because we did a lot of things right this weekend, but I've got a smile on my face as I could not have done any more."

Webber's retirement came in the race where Vettel and the team were able to secure the championship titles for the fourth successive season, with team boss Christian Horner admitted that Webber's failure to finish was the only disappointment.

"The most disappointing thing today was obviously the failure on Mark's car when we were set for a 1-2 finish," he said. "We had a sudden alternator failure, but sometimes that's racing. It was just desperately disappointing to happen while we were on course to achieve a 1-2 finish.

"I think it's going to take quite a few days for this success to sink in and it's important for the team to enjoy the moment - we will be pushing all the way to the chequered flag in Brazil."