He may be closing in on a fourth World title but Lewis Hamilton insists he won't change his approach at this weekend's United States GP. 59 points ahead of Sebastian Vettel in the title race, Hamilton could wrap it up in Austin this weekend. The Mercedes driver needs to claim the race win and have Vettel finish sixth or lower. 'Nothing changes,' he said. 'I have to continue to keep the pressure on. There is no reason to back out, I have to keep pushing forward. 'The championship – as long as it is done in the last four races that is my focus. 'I honestly don't care if it is here or the last race, as long as it is done. 'I think winning [the race] here is the most important thing for...
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