Red Bull's Sebastian Vettel signalled his title defence isn't over yet yesterday as he scorched to the quickest times in both opening practice sessions for the Singapore Grand Prix.
On the floodlit street circuit, damp after heavy afternoon rain, the two-time defending champion clocked 1min 50.566sec in the first stint and then lowered it to 1:48.340 in the later run. McLaren’s Jenson Button was second quickest in the later session followed by the championship leader, Fernando Alonso of Ferrari.u00a0
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