Vettel focused on title target

Red Bull's Sebastian Vettel says he is not "wasting energy" thinking about the possibility of another driver becoming world champion.

The defending champion is 10 points clean of Ferrari's Fernando Alonso going into the weekend's US Grand Prix in Austin, Texas.

The German, who is aiming for his third drivers' title in a row, is looking forward to Friday's first practice session to get out on the Circuit of The Americas track for the first time, admitting the team "don't quite know what to expect".

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