Five drivers to challenge Vettel for 2014 crown

Five drivers who look most likely to challenge Sebastian Vettel as the German bids to win fifth a consecutive Formula One world championship title this year:

Lewis Hamilton (Mercedes)
The 29-year-old Briton is the early favourite to usurp Vettel and land his second world title after showing impressive form in pre-season testing with German marque Mercedes.

After leaving long-term employer McLaren, Hamilton scored a victory in Hungary, four podiums and five poles on the way to finishing fourth in the drivers’ championship.

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