United States GP: Sebastian Vettel on top in second practice
Sebastian Vettel tops the timings in Texas as he pips team-mate Mark Webber by 0.115 seconds in second practice for the United States Grand Prix.
Mercedes' Nico Rosberg is third from team-mate Lewis Hamilton, while Britain's Max Chilton spins out in his Marussia late on after suffering brake failure.
Vettel nearly a second a lap faster than the best driver from any other team during the race-simulation runs in the final part of the session, with Webber a few tenths of a second behind his team-mate.
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