Sebastian Vettel insists there is room for improvement at Red Bull after ending Friday practice for the Korean Grand Prix in second place.The defending champion goes into the weekend seeking to extend his championship advantage following a dominant success last time out in Singapore.Although expected by many to be the man to beat, Vettel instead had to settle for second place in both Friday sessions behind the Mercedes of Lewis Hamilton.Speaking afterwards, Vettel admitted he was ready for a stern challenge from Mercedes through the remainder of the weekend, with Red Bull still having more to come.“There is some room for improvement,” he said. “It will be close with Mercedes; of...
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