for the full United States Grand Prix FP1 result
Nico Rosberg has opened up quickest in first free practice for the United States Grand Prix as drivers took advantage of wet weather running on a weekend that is set to be blighted by inclement weather.
As predicted, the stormy weather front being pushed towards Texas by the onset of Hurricane Patricia just south of Mexico made its presence felt in time for FP1, with the circuit proving slippery – if not sodden – throughout.
Indeed, though air temperatures remained close to 30 degrees and the rain would stay away for FP1, high humidity ensured the circuit never evolved from damp in most places.
Despite this, with wet weather predicted until at least qualifying, there was still plenty of track action as the teams fettled what could be a crucial wet weather set-up, with most completing between 10 and 20 laps each.
Topping the timesheets was Rosberg, who stopped the clock at 1min 53.989secs, a full 17secs down on last year's pole-winning time, but enough for the Mercedes driver to prove 1.2secs faster than the opposition.
Red Bull pair Daniil Kvyat and Daniel Ricciardo followed in second and third, ahead of Carlos Sainz and Lewis Hamilton, the champion elect fifth best despite completing just four laps.
Sebastian Vettel and Max Verstappen followed up in sixth and seventh, with Kimi Raikkonen recovering to eighth despite taking time out to fix a suspected brake issue. Fernando Alonso and Valtteri Bottas rounded out the top ten, the former one of a handful of find the limit on the slippery track, though only Felipe Massa suffered a spin early on at turn nine.
Elsewhere, Sauber test driver Raffaele Marciello was 16th fastest and faster than Marcus Ericsson, while Pastor Maldonado failed to complete a lap after developing gearbox problems early on.