GREATER NOIDA, India - Red Bull's Sebastian Vettel completed a practice hat-trick on October 27 with the fastest time in a smog-shortened final session before qualifying for a race expected to bring him a fourth successive Formula 1 title - the 2013 Indian GP.Vettel lapped the Buddh International Circuit with a best time of 1min25.332 seconds, a whopping half a second quicker than team mate Mark Webber in second place.SESSION DELAYEDThe lap, only fractionally slower than 2012's pole position time of 1min25.283, meant Vettel had topped all three practice sessions - as he did in 2012 before going on to win from pole.Red Bull, who can wrap up their fourth consecutive constructors' title on October 27 2013, have also been one-two in all three.The session was delayed by 20 minutes due to smoggy haze shrouding the circuit, built on farmland to the south-east of New Delhi, that prevented the medical helicopter from operating in the case of emergency.A truncated 40 minute session finally started with a flurry of activity.The problems echoed those experienced by MotoGP in Japan, where practice for the penultimate round of that championship had to be cancelled due to rain and fog grounding medical helicopters.MECHANIC STRUCK DOWNFerrari's Fernando Alonso, the only man who can deny Vettel the title on Sunday providing he finishes in the top two positions, was third fastest with a lap of 1min26.105.Alonso is 90 points behind Vettel with a maximum 100 still to be won. Sauber's Nico Hulkenberg was fourth fastest ahead of Romain Grosjean in the Lotus.Sauber's Esteban Gutierrez hit a kerb hard and his car was launched momentarily into the air before hitting the asphalt hard. Hulkenberg also clipped one of his mechanics, who was knocked over but appeared unhurt, in the pit lane.2013 Indian Grand Prix at Buddh International circuit: Third practice session1 Sebastian Vettel (Germany) Red Bull 1min25.3322 Mark Webber (Australia) Red Bull 1min25.8923 Fernando Alonso (Spain) Ferrari 1min26.1054 Nico Huelkenberg (Germany) Sauber 1min26.3065 Romain Grosjean (France) Lotus 1min26.3506 Felipe Massa (Brazil) Ferrari 1min26.4357 Paul Di Resta (Britain) Force India 1min26.4388 Nico Rosberg (Germany) Mercedes 1min26.4419 Jenson Button (Britain) McLaren 1min26.48910 Lewis Hamilton (Britain) Mercedes 1min26.55711 Kimi Raikkonen (Finland) Lotus 1min26.63512 Pastor Maldonado (Venezuela) Williams 1min26.64113 Sergio Perez (Mexico) McLaren 1min26.73714 Adrian Sutil (Germany) Force India 1min26.84715 Jean-Eric Vergne (France) Toro Rosso 1min26.87616 Valtteri Bottas (Finland) Williams 1min26.88317 Daniel Ricciardo (Australia) Toro Rosso 1min27.25918 Charles Pic (France) Caterham 1min27.94119 Esteban Gutierrez (Mexico) Sauber 1min28.01920 Giedo van der Garde (Netherlands) Caterham 1min28.49821 Max Chilton (Britain) Marussia 1min29.09422 Jules Bianchi (France) Marussia 1min29.169Second practice:1 Sebastian Vettel (GER) Red Bull 1min25.7222 Mark Webber (AUS) Red Bull 1min26.0113 Romain Grosjean (FRA) Lotus 1min26.2204 Lewis Hamilton (GBR) Mercedes 1min26.3995 Fernando Alonso (ESP) Ferrari 1min26.4306 Nico Rosberg (GER) Mercedes 1min26.5827 Felipe Massa (BRA) Ferrari 1min26.6018 Kimi Raikkonen (FIN) Lotus 1min26.6329 Sergio Perez (MEX) McLaren 1min26.85710 Jenson Button (GBR) McLaren 1min26.97211 Daniel Ricciardo (AUS) Toro Rosso 1min27.30412 Adrian Sutil (GER) Force India 1min27.37513 Valtteri Bottas (FIN) Williams 1min27.42914 Nico Hulkenberg (GER) Sauber 1min27.49115 Paul Di Resta (GBR) Force India 1min27.60816 Pastor Maldonado (VEN) Williams 1min27.72017 Esteban Gutierrez (MEX) Sauber 1min27.94918 Jean-Eric Vergne (FRA) Toro Rosso 1min28.43119 Giedo van der Garde (NED) Caterham 1min28.69220 Jules Bianchi (FRA) Marussia 1min28.79921 Charles Pic (FRA) Caterham 1min29.36622 Max Chilton (GBR) Marussia 1min30.164First practice session1. Sebastian Vettel (Germany) Red Bull 1min26.683 2. Mark Webber (Australia) Red Bull 1min26.871 3. Nico Rosberg (Germany) Mercedes 1min26.899 4. Romain Grosjean (France) Lotus 1min26.990 5. Lewis Hamilton (Britain) Mercedes 1min27.227 6. Jenson Button (Britain) McLaren 1min27.335 7. Sergio Perez (Mexico) McLaren 1min27.416 8. Felipe Massa (Brazil) Ferrari 1min27.692 9. Nico Hulkenberg (Germany) Sauber 1min27.770 10. Valtteri Bottas (Finland) Williams 1min27.800 11. Jean-Eric Vergne (France) Toro Rosso 1min28.035 12. Fernando Alonso (Spain) Ferrari 1min28.214 13. Daniel Ricciardo (Australia) Toro Rosso 1min28.336 14. Pastor Maldonado (Venezuela) Williams 1min28.342 15. Adrian Sutil (Germany) Force India 1min28.468 16. Esteban Gutierrez (Mexico) Sauber 1min28.538 17. Kimi Raikkonen (Finland) Lotus 1min28.730 18. James Calado (Britain) Force India 1min29.197 19. Giedo van der Garde (Netherlands) Caterham 1min29.413 20. Jules Bianchi (France) Marussia 1min29.560 21. Charles Pic (France) Caterham 1min30.026 22. Max Chilton (Britain) Marussia 1min30.471 Stay with Wheels24 for the 2013 Indian GP weekend.