Mark Webber blamed his disappointing qualifying performance at the Brazilian Grand Prix on being unable to get the best out of his final set of intermediate tyres.
The Australian had looked set to be a threat for pole position with Red Bull again so strong at Interlagos, but in the end he could manage no better than fourth - more than one second adrift of team-mate Sebastian Vettel.
"I just never felt comfortable on the last set," explained Webber. "It was better on the extreme.
"With the inters, I knew it was rubbish on the first lap - so I tried to get it on the second lap, and the third lap. I thought I would be worse off anyway, so that was that."
Webber's struggles on the intermediates mean he would prefer a dry race on Sunday, but he also knows changeable weather conditions offer him an opportunity to upset the formbook.
"It makes it a lot trickier and it does open it up a lot," he said. "We know that and history shows that when you have greasy wet races, intermediate, safety cars, full wets, driver errors, all sorts - it happens."
When asked if he believed then that there was a chance to win, he said: "There are also other cars in front, not just Seb unfortunately.
"He is the favourite and he has won the last 1000 races, so we will see how it goes tomorrow."