World champion Sebastian Vettel on Saturday admitted he needs to up his game.
The German has won the last four drivers' titles on the trot, but all of them were alongside Mark Webber, who retired at the end of last season.
Australian Webber was replaced at Red Bull by his compatriot Daniel Ricciardo, who so far in 2014 has outqualified Vettel on no fewer than three out of four attempts.
Told that Ricciardo is clearly more competitive than Webber, Vettel said after qualifying in China: "Well, that's (not) a compliment to Mark, I should say, in his absence.
"I think this year is very, very different, the cars are very different so I don't think you can compare last year to this...
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