After an intriguing first week in Barcelona, teams now just have four days left of testing before the 2017 championship officially begins. And it's fair to say some have more to work on than others. World champions Mercedes seem to have once again embraced the technical changes, taking to Formula 1's 'rules refresh' seamlessly as they finished Test One with the fastest time and the most laps. Still, perhaps Lewis Hamilton and Valtteri Bottas' lack of running on Day Four thanks to an electrical issue, along with the possible engine concerns back at base, will give challengers such as Ferrari some hope for Test Two and beyond. If the Scuderia weren't the most impressive team last week they...
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