Spanish GP: Nico Rosberg heads Lewis Hamilton in first practice

Nico Rosberg leads the way ahead of Mercedes team-mate Lewis Hamilton in first free practice for the Spanish Grand Prix in Barcelona.

The German headed Hamilton by just 0.07 seconds as the two silver cars were a second clear of the Ferraris of Sebastian Vettel and Kimi Raikkonen.

The Toro Rosso's of Carlos Sainz and Max Verstappen were fifth and sixth, with McLaren's of Fernando Alonso and Jenson Button 15th and 16th.

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