Mercedes driver Lewis Hamilton says he is not concerned by the fact that he has not won a race so far this season. Hamilton trails Sebastian Vettel by nine points after three races, after two wins for the Ferrari driver and one for Red Bull's Daniel Ricciardo. Hamilton said: "It's only been three races. We would like to have won races but it has been a learning process. "We know it's a three-way battle. It is not going to be easy and it requires a lot of work to perform at our best." Hamilton said he arrived at this weekend's Azerbaijan Grand Prix feeling "refreshed" after a break since the last race in China, during which he attended a music festival in California....
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