Red Bull's Sebastian Vettel once again proved to be the fastest as he topped the timesheet in the final practice session ahead of the qualification for Formula One Indian Grand Prix on Saturday.Vettel, who was fastest in FP1 and FP 2 on Friday, clocked 1:25.842 to emerge fastest and was followed by McLaren's Jenson Button, who was 0.192 second behind at the Buddh International Circuit.His team-mate Mark Webber was third while Lewis Hamilton put the second McLaren in the fourth position.Surprisingly, Finnish Kimi Raikkonen and Bruno Senna pushed Ferrari's Fernando Alonso to seventh by finishing ahead of him.Sahara Force India's Nico Hulkenberg continued to improve and was eighth followed by Mercedes' Michael Schumacher and Romain Grosjean of Lotus.The lone Indian driver Narain Karthikeyan (1:30.873) finished 23rd ahead of his HRT teammate Pedro de la Rosa.