Mark Webber says Sebastain Vettel needs to win the title this weekend in Austin

Mark Webber believes team-mate Sebastian Vettel needs to win the title in Austin this weekend - rather than risking the lottery Brazil could throw up.

Webber's race at Yas Marina was immediately compromised by a poor getaway at the lights, which dropped him from second to fifth at the end of the first lap, and the Australian admits it's not an experience he wants to repeat. ''You just don't want to be in the position where you need to be coming back and fighting through because, ultimately, it'll come and bite you in the arse,'' he said. ''When you have a poor start, you're exposed. All of a sudden you have to do some racing, which I'm fine with, but the numbers are a bit more against you in terms of having smooth Sunday afternoons when you get caught in the pack. You might have a little bit of contact here and there, which we did.''