Lewis Hamilton has said he is finding it difficult to get the best out of this year's Mercedes.
Car upgrades helped Hamilton's team-mate George Russell to Mercedes' best qualifying position of the season with fourth at the Spanish Grand Prix.
Hamilton, 0.119 seconds slower than Russell in sixth, said he was "really struggling with the car this year".
"The car has potential to be third or fourth and I am not able to pull that out of the car," Hamilton said.
"I just don't feel that great in the sense of my driving and I'm working as hard as I can.
"I am still way off. I just struggle with confidence in the rear of the car. I don't know how to get around that.
"I don't know what I am going to do but I will keep trying to work hard and trying to figure it out. I just have no rear end in the car in the qualifying sessions."
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