World championship leader Sebastian Vettel secured his fifth pole position of the season after posting the fastest time in Saturday’s crash-marred qualifying session at the Monaco Grand Prix.

Vettel’s best lap time of 1 minute, 13.556 seconds gave Red Bull its sixth straight pole, ahead of McLaren’s Jenson Button and Vettel’s teammate Mark Webber.

Webber took pole at last week’s Spanish Grand Prix, Vettel took the previous four poles and already leads McLaren’s Lewis Hamilton overall by 41 points.

It was a disappointing session for Ferrari’s Fernando Alonso, who was quickest in the final practice on Saturday morning, but dropped to fourth in qualifying.

Mexican driver Sergio Perez crashed his Sauber exiting the tunnel near the end of qualifying.

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