Singapore GP: Vettel fastest in final practice

Singapore: Red Bull driver Sebastian Vettel has set the fastest time in Saturday's pre-qualifying practice session at the Singapore Grand Prix, bettering McLaren's Lewis Hamilton by a third of a second.

Vettel made it a sweep of all three practice sessions at Marina Bay to be well positioned to chase pole position later Saturday.

Championship leader Fernando Alonso of Ferrari was third fastest, two thirds of a second behind Vettel, followed by Force India's Nico Hulkenberg and Lotus' Kimi Raikkonen.

The session came to a premature end when Caterham's Vitaly Petrov crashed at the pit entry, while Red Bull's Mark Webber and Sauber's Sergio Perez also made contact with the walls earlier in the session.