Red Bull dominated the second practice session at the Belgian Grand Prix with both drivers nearly a second clear of the rest of the field. Sebastian Vettel beat Mark Webber by 0.059 seconds, with Lotus's Romain Grosjean third, 0.8secs behind. Vettel suffered an alarming moment when his right rear tyre failed. It was not initially clear what caused the problem. Ferrari's Fernando Alonso was seventh and Mercedes' Lewis Hamilton 12th. Hamilton appeared to be struggling with a lack of grip, saying at one point the car was 'all over the place'. McLaren's Jenson Button, who won in Belgium last year, also had problems, complaining of an unstable rear end while braking. Ferrari's Felipe Massa was...
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