Five themes to watch out for in China

Five themes to watch out for in China

Will Vettel's KERS go the distance in Shanghai? Can Webber fight back through the field? How many stops are people likely to make in Sunday's race? All valid questions as Edd Straw looks at the developing themes this weekend

Vettel versus KERS

Let's face it, it seems that Red Bull's troublesome KERS is the most obvious obstacle standing between Sebastian Vettel and a fifth consecutive victory. The German's hybrid system worked well during qualifying, but team-mate Mark Webber was without it, so it's clear that this remains the Achilles Heel of Red Bull.

It is also clear that Vettel had a little in hand last week in Malaysia, especially when you take into account the very conservative set up that gave away a good chunk of performance in the pursuit of better tyre degradation, so even if KERS is unusable, he's going to be favourite to win. But, if he does prove unable to use it, the lack of KERS might just allow a McLaren to make a DRS-assisted pass.

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