US GP: Lewis Hamilton fastest in very wet final practice session

Championship leader Lewis Hamilton set the pace in a rain-hit final practice for the Formula 1 United States Grand Prix

US GP: Lewis Hamilton fastest in very wet final practice session

Heavy rain lashed Austin on Saturday casting doubt as to whether the session at the Circuit of the Americas would run on schedule.

But after sending the safety car out to assess conditions, officials deemed the track clear for use and practice began on time.

With second practice on Friday cancelled because of bad weather, there was plenty of running in the opening half off the session before the rain intensified.

With rivers running across the track and puddles forming in places, the teams were informed by race control that intermediates were could not be used.

Nico Rosberg was among the first drivers to get caught out by the conditions, spinning at Turn 3 and tapping the barrier, which broke his front wing.

His Mercedes team-mate Hamilton also had a moment, catching the rear-end as it stepped out at Turn 13 before continuing.

However, the reigning world champion managed to get a flying lap in shortly before conditions started to worsen, moving himself to the top of the order.

Sebastian Vettel had a messy session, spinning first at Turn 19 and then Turn 9 and then complaining about aquaplaning as conditions worsened in the final half of the session.

The Ferrari driver did manage to set the second fastest time of the session though, ahead of Nico Hulkenberg, Valtteri Bottas and Carlos Sainz Jr.

There were no improvements in the final 20 minutes, but several drivers headed out on track to perform practice starts, particularly as there's a chance the start of Sunday's race could be wet.

Daniil Kvyat was sixth with Kimi Raikkonen, Daniel Ricciardo, Nico Rosberg and Felipe Massa completing the top 10.

Should qualifying not be able to take place at any point, the regulations suggest the grid will take the order in which they were classified in final practice.

Rain is expected to continue throughout Saturday, but even if qualifying is unable to be completed as scheduled, it could run on Sunday ahead of the race, as was the case for the Australian Grand Prix in 2013.

FP3 TIMES

Pos Driver Car Time Gap Laps
1 Lewis Hamilton Mercedes 1m59.517s - 9
2 Sebastian Vettel Ferrari 2m00.380s 0.863s 9
3 Nico Hulkenberg Force India/Mercedes 2m00.496s 0.979s 12
4 Valtteri Bottas Williams/Mercedes 2m00.523s 1.006s 14
5 Carlos Sainz Jr. Toro Rosso/Renault 2m00.687s 1.170s 11
6 Daniil Kvyat Red Bull/Renault 2m00.694s 1.177s 12
7 Kimi Raikkonen Ferrari 2m00.785s 1.268s 9
8 Daniel Ricciardo Red Bull/Renault 2m01.008s 1.491s 12
9 Nico Rosberg Mercedes 2m01.474s 1.957s 7
10 Felipe Massa Williams/Mercedes 2m02.199s 2.682s 13
11 Sergio Perez Force India/Mercedes 2m02.660s 3.143s 12
12 Romain Grosjean Lotus/Mercedes 2m02.825s 3.308s 10
13 Pastor Maldonado Lotus/Mercedes 2m02.921s 3.404s 11
14 Fernando Alonso McLaren/Honda 2m03.375s 3.858s 9
15 Marcus Ericsson Sauber/Ferrari 2m04.399s 4.882s 13
16 Jenson Button McLaren/Honda 2m05.283s 5.766s 7
17 Will Stevens Marussia/Ferrari 2m05.378s 5.861s 10
18 Alexander Rossi Marussia/Ferrari 2m05.607s 6.090s 10
19 Felipe Nasr Sauber/Ferrari 2m06.792s 7.275s 10
20 Max Verstappen Toro Rosso/Renault 2m09.994s 10.477s 7

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