The title fight is still far too close to call as Formula 1 heads for one of its most evocative races in Singapore this weekend. David Coulthard evaluates the battle to come

We have a straight race between five guys for the world championship now, with just five races left. It's been an up and down season, but there's not going to be a bad driver winning this title.

There's not a question mark over any of these drivers – three of them are world champions already, and nobody doubts the credentials of Mark Webber and Sebastian Vettel. With that in mind, it comes down to a development race between the teams, to see who can give its drivers the best equipment possible.

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