Red Bull chief Christian Horner admitted Sebastian Vettel’s run of five successive wins was beyond his imagination after the breakaway Formula One championship leader swept to victory in Sunday’s Japanese Grand Prix. Teammate Mark Webber’s three-stop strategy ended in a second place, from pole, and came under scrutiny following a pulsating Suzuka race. But Horner insisted that, whichever way you diced it, Vettel was in a class of his own. ‘Sebastian has won every race since the summer break which is an incredible achievement,’ gushed Horner. ‘Still four races to go. Our target is to try to carry this momentum into the last four races. ‘I don’t think any of us could have imagined that he would have had the run of success that he’s had. The way he’s driving at the moment is quite supreme.’