Lewis Hamilton maintained his form in Friday's second practice where he edged Sebastian Vettel by 0.108s.
Although many arrived in Korean worried that Vettel would run away with it like he did last time out in Singapore, there were signs on Friday that the German would not have it all his own way.
While Hamilton led the way on the medium tyres ahead of a Mercedes - Red Bull lock out of the top four positions, it was the Brit who again set the pace on the supersoft tyres.
Switching the red marked Pirellis, Hamilton posted a 1:38.673 to edge his team-mate Nico Rosberg and Mark Webber.
However, when Vettel came out for his run on the quicker tyres - one of the last to do so - he jumped to...
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