Lewis Hamilton admitted he needed to 'work harder' to adapt to his Mercedes' wet-weather characteristics after being outpaced by team-mate Nico Rosberg in Brazilian Grand Prix qualifying.
Hamilton took several famous victories in the rain during his McLaren career, but since moving to Mercedes for the 2013 Formula 1 season he has struggled in the wet.
He said being half a second off front-row qualifier Rosberg and only fifth on the Interlagos grid was no surprise.
"That's kind of where I thought I would be, considering," said Hamilton.
"I did my best out there but I'm struggling. There's not really much more I can say."
Hamilton believes the main issue is a lack of mileage in the Mercedes in the rain.
"When I was at McLaren, I knew the car," he said.
"I was there for a long, long time and it suited me easier than the one I'm driving right now.
"I've just got to do some more work."