Sebastian Vettel tops third practice of US Grand Prix

Sebastian Vettel has dominated the practice sessions ahead of tomorrow's US Grand Prix by clocking the fastest time in the third and final session.

The Red Bull driver has maintained his stronghold on the timesheets, with McLaren's Lewis Hamilton emerging as his closest challenger after finishing second in the third practice in Austin, Texas.

Despite his dominance, Vettel's times in all three sessions have been whittled down from 1.4 seconds in the first, 0.7 in the second and 0.2 in today's practice.

Meanwhile, Ferrari's Fernando Alonso, who is currently 10 points behind Vettel in the drivers' standings, clocked the fourth-quickest time.

Third practice standings:

1. Sebastian Vettel (Red Bull) - 1:38.125 2. Lewis Hamilton (McLaren) - 1:39.543 3. Fernando Alonso (Ferrari) - 1:40.337 4. Jenson Button (McLaren) - 1:40.528 5. Mark Webber (Red Bull) - 1:40.650 6. Felipe Massa (Ferrari) - 1:40.966 7. Nico Hulkenberg (Force India) - 1:41.023 8. Kamui Kobayashi (Sauber) - 1:41.036 9. Nico Rosberg (Mercedes) 1:41.159 10. Sergio Perez (Sauber) 1:41.473 11. Paul Di Resta (Force India) - 1:41.783 12. Daniel Ricciardo (Toro Rosso) - 1:41.825 13. Jean-Eric Vergne (Toro Rosso) - 1:41.833 14. Kimi Raikkonen (Lotus) - 1:41.880 15. Romain Grosjean (Lotus) - 1:41.998 16. Pastor Maldonado (Williams) - 1:42.539 17. Michael Schumacher (Mercedes) - 1:42.588 18. Charles Pic (Marussia) - 1:43.288 19. Heikki Kovalainen (Caterham - 1:43.443 20. Vitaly Petrov (Caterham) - 1:43.522 21. Timo Glock (Marussia) 1:44.464 22. Bruno Senna (Williams) 1:44.548 23. Pedro de la Rosa (HRT) - 1:46.917 24. Ma Qinghua (HRT) - 1:48.559