Lewis Hamilton returned to the top of the timesheet as Mercedes dominated first practice for the Spanish GP with a heavily-revised car. All eyes had been on what Red Bull would introduce for Barcelona after a disappointing start to the season, but it was Constructors' Championship leaders Mercedes whose W08 made the bigger immediate visual impact with significant changes to the front of the car. After an off-the-pace weekend in Russia, Hamilton hit the front early at Barcelona with a fastest time of 1:21.521. He was only 0.029s than Sochi race winner Valtteri Bottas, but nearly a second quicker than Ferrari as Kimi Raikkonen and Sebastian Vettel finished third and fourth respectively....
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