World champion Sebastian Vettel outclassed the rest of the field by more than half a second when he dominated free practice for the Italian Formula One Grand Prix ahead of Red Bull teammate Mark Webber.

Vettel sped around the 5.793-kilometre course in 1 minute 24.453 seconds in a sunny and warm afternoon in Monza.

Webber followed on 1:25.076 while Lotus drivers Kimi Raikkonen and Romain Grosjean posted identical times of 1:25.116. Fernando Alonso was fifth in 1:25.330, and Lewis Hamilton of Mercedes came sixth in 1:25.340.

While Vettel held a huge lead of 0.623 seconds, Webber was less than six tenth faster than 10th place Sergio Perez of McLaren, promising a close qualifying on Saturday.

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