We're back! It's the start of the second week in Barcelona meaning all things Formula 1 start to get a lot more serious as we edge closer and closer to the Australian Grand Prix. We'll have all the important updates in our liveblog below! Will Mercedes showcase some more innovations? Will Ferrari bounce back from a quiet week in pre-season? Will we get any more signs that Aston Martin Red Bull Racing have closed the gap?  Lewis Hamilton will get things underway for Mercedes before Valtteri Bottas takes over in the afternoon. And that shift split is a common theme up and down the F1 paddock as teams try to cram the same amount of running as last year into two fewer days. Sebastian...
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