Brendon Hartley is the leading contender to drive for the Toro Rosso Formula 1 team in the United States Grand Prix, with Sebastien Buemi the back-up option, Motorsport.com has learned. Toro Rosso needs to fill the seat alongside Daniil Kvyat at Austin after it was agreed Pierre Gasly would return to Super Formula to contest for the title in the finale on the same weekend. It is understood Toro Rosso team principal Franz Tost wants to use Austin as an opportunity to evaluate a new driver as he weighs up his 2018 driver line-up. Gasly is favourite to get one of the seats, having impressed in his appearances in Malaysia and Japan for the team, but Tost and Red Bull are less certain about...
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