– Mercedes driver Lewis Hamilton has played down the issues he suffered on the opening day of practice for the United States Grand Prix.Hamilton reported an upshift problem during Friday's second session, before the team called him in 15 minutes from the end as a precaution.But the Briton, who outpaced team-mate Nico Rosberg by 0.003 seconds, was unfazed when talking through the events with the media."There was fluid on the floor, a leak of some sort, but I don't think it is anything too concerning," Hamilton explained."It obviously doesn't help when you lose a little bit of time on the long runs, because you get a really good understanding of the balance and how much...
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