Lewis Hamilton dominated final practice for the United States Grand Prix. He mastered the wet conditions to put his Mercedes ahead of the Ferraris and his own team-mate.
The drenched session could set the starting grid for Sunday’s race if qualifying is unable to be held either later this afternoon or on Sunday morning due to the forecast conditions.
That would see Hamilton starting in pole ahead of his championship rivals.
Sebastian Vettel was second fastest ahead of the Force India’s Nico Hulkenberg and the Williams of Valtteri Bottas, over a second adrift of Hamilton.
Nico Rosberg finished ninth fastest after he span off into the gravel, making brief contact with the barrier, damaging his front-wing.
McLaren’s Fernando Alonso was 14th, almost two seconds ahead of team-mate Jenson Button.
2015 United States Grand Prix Practice Times (FP3):
| # | Driver | Team | Time | Gap | Laps |
| 01 | Lewis Hamilton | Mercedes | 1:59.517 | – | 9 |
| 02 | Sebastian Vettel | Ferrari | 2:00.380 | 0.863 | 9 |
| 03 | Nico Hulkenberg | Force India | 2:00.496 | 0.979 | 12 |
| 04 | Valtteri Bottas | Williams | 2:00.523 | 1.006 | 14 |
| 05 | Carlos Sainz | Toro Rosso | 2:00.687 | 1.170 | 11 |
| 06 | Daniil Kvyat | Red Bull | 2:00.694 | 1.177 | 12 |
| 07 | Kimi Raikkonen | Ferrari | 2:00.785 | 1.268 | 9 |
| 08 | Daniel Ricciardo | Red Bull | 2:01.008 | 1.491 | 12 |
| 09 | Nico Rosberg | Mercedes | 2:01.474 | 1.957 | 7 |
| 10 | Felipe Massa | Williams | 2:02.199 | 2.682 | 13 |
| 11 | Sergio Perez | Force India | 2:02.660 | 3.143 | 12 |
| 12 | Romain Grosjean | Lotus | 2:02.825 | 3.308 | 10 |
| 13 | Pastor Maldonado | Lotus | 2:02.921 | 3.404 | 11 |
| 14 | Fernando Alonso | McLaren | 2:03.375 | 3.858 | 9 |
| 15 | Marcus Ericsson | Sauber | 2:04.399 | 4.882 | 13 |
| 16 | Jenson Button | McLaren | 2:05.283 | 5.766 | 7 |
| 17 | Will Stevens | Marussia | 2:05.378 | 5.861 | 10 |
| 18 | Alexander Rossi | Marussia | 2:05.607 | 6.090 | 10 |
| 19 | Felipe Nasr | Sauber | 2:06.792 | 7.275 | 10 |
| 20 | Max Verstappen | Toro Rosso | 2:09.994 | 10.477 | 7 |
