Mexican GP: Max Verstappen quickest in practice one for Toro Rosso

The teenager clocked a 1m25.990s late in the session as the track conditions improved to finish 0.305 seconds clear of Daniil Kvyat's Red Bull, with Ferrari's Kimi Raikkonen third.

Verstappen's time raised eyebrows in the pitlane as he had gone off course in the esses section on the way to setting the fastest time, cutting across the run-off area at the second part of the corner after a mistake on the way in.

Drivers started the session on the intermediates after overnight rain in Mexico City left the circuit damp in places.

Conditions were tricky due to the combination of a wet track and freshly laid asphalt, with Sebastian Vettel reporting it was "ridiculously slippery".

Valtteri Bottas set the early pace for Williams, clocking a 1m31.868s, before the field started to make the switch to the medium tyres after half an hour.

Despite the track drying out, the circuit remained tricky - with several drivers running off, particularly at Turns 8 and 10.

Nico Rosberg moved into first place, but then skated off track at the entrance to the stadium with smoke pouring from the rear wheels and flames around his brakes.

The German recovered to the pits, where Mercedes worked on a fix to aid cooling and got him out for the final minutes of the session.

The Mexico City track is located 2220 metres above sea level, which means the air is thinner and in turn puts pressure on brake and engine cooling.

Rosberg was eventually demoted to sixth, behind Vettel and Daniel Ricciardo, and ahead of Bottas and Carlos Sainz Jr.

Driving on home soil, Sergio Perez drew huge cheers from a decent crowd on Friday and finished ninth, with Felipe Massa completing the top 10.

Newly-crowned world champion Lewis Hamilton clocked up 27 laps, 10 fewer than Sainz who completed the most, but set his best time early in the session. That left him 11th.

Jolyon Palmer, who will contest all the remaining Friday morning practice sessions this season ahead of his race debut with Lotus next year, was 15th, two tenths slower than team-mate Pastor Maldonado.

Jenson Button completed just nine laps before parking his McLaren in the garage so the team could complete a scheduled engine change, his second of the weekend and one that will cause him to take a 50-place grid penalty.

PRACTICE ONE TIMES: