Despite taking pole position in Korea, Sebastian Vettel reckons he faces a "tight battle" from Mercedes come Sunday's grand prix.
The Red Bull racer claimed his third successive pole position and his second in Korea when he edged Lewis Hamilton to the P1 slot on Saturday.
Clocking a 1:37.202 on his first flying lap in Q3, the German's time proved to be unbeaten with Hamilton falling 0.218s behind.
Vettel, though, is adamant he won't be running away with it on Sunday as he did last time out in Singapore as he expects a stern test from Mercedes.
"I think it was fairly close as you could see," said the reigning World Champion.
"I had a very very good lap in Q3 on my...
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