Lewis Hamilton fears he will be the underdog in the remaining six races of the Formula One season.
Hamilton heads into this weekend's Russian Grand Prix with just two victories from his last seven appearances – and a disappointing fourth in Singapore last weekend – while a resurgent Ferrari bid for their fourth win in succession.
Mercedes are unbeaten at the Sochi Autodrome, winning all of the five races staged here.
A tired-looking Hamilton arrived here on Thursday following a Mercedes sponsorship commitment in Malaysia on Tuesday.
He then stopped over in Dubai before making the journey to Russia for the 16th round of the 21-race campaign.
He added: "Today I am pretty groggy, but I will be good tomorrow."
