BARCELONA (Reuters) - Lewis Hamilton led a Mercedes one-two in Spanish Grand Prix practice on Friday while Red Bull's world champion Sebastian Vettel was sidelined for most of the two sessions by an electrical problem.
Race favourite Hamilton was quickest in both, 0.449 of a second faster than championship-leading team mate Nico Rosberg in the afternoon and 0.868 ahead of McLaren's Jenson Button in the morning.
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